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For some Paramecia type, to use their power, they must do something with parts
of their body.

Just like how Bartholomew must cross his finger to create a barrier, or Foxy
must stick his thumb, middle, and ring finger together to create Noro Noro
beam.

But how can they know that crossing or sticking three of their fingers will
activate their powers?


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one-piece
How does the Devil Fruit user know how to activate their power?


I think devil fruit users has no specific way of activating their power rather
than **training** and **practice**. They discover it by their own because as
we can see on each devil fruit users learns new techniques after they train
hard using their ability.

We don't exactly know the story of other fruit users how they discovered to
activate their powers but we can make Luffy as an example because from the
start we have seen his story.

After Luffy became a rubber man when he was still a kid he doesn't know how to
activate his ability. But through his every day training and challenge to
defeat his brother Ace he created and discovered his very first technique
_Gomu Gomu no Pistol_. And created more techniques as he discover more ways to
use his ability. Another example is his Second Gear before he needs to sit to
activate it but later after training and practice even standing he can
activate it.

As for Bartholomew and Foxy since we haven't seen their story we can assume
that they also discovered it through the same process or accidentally
discovered it. They did a lot of tests to discover a more effective way to use
their power. For example Foxy might discovered that when he stick his thumb,
middle, and ring finger together his _Noro Noro Beam_ last longer than using
only one of his finger. The same as Bartholomew, he might discovered it
through practice that crossing his finger creates a stronger barrier than just
one finger.

Another good example is Flamingo. He only discovered and learned his awaken
through training and practice.

So activating their power depends on what they discover from themselves of
what they are capable to do and refine it throug training and practice.


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There seem to be 3 different ways to learn this:

  * Experimentation

If a user has no idea exactly how his fruit can be used, he can play around
with different motions movements or just live his life. Brook never figured
out what his fruit could do until he was already dead. Hypothetically,
Bartolomeo could have lived his life without finding out if he hadn't happened
to cross his fingers the right way (assuming that is required).

  * Reason

Some users have some idea what their fruit is when they eat it. Others only
have partial knowledge of their abilities. The Barrier Fruit is based off a
[children's game](https://anime.stackexchange.com/questions/11477/how-does-
the-barrier-taunt-work?s=2%7C1.2216). If Bartolomeo knew that he had this
fruit, they could have tried to enact that game to see if it worked. This can
be combined with experimentation to improve fruits. Bartholomew Kuma and Law
seem to have decided to try appying their abilities to abstract concepts and
studied their ability to learn how to do this. Other fruits may have simular
unusual uses that are never noticed as the users aren't as smart as those two.

  * Historical Research

Devil Fruits are not single use. They are reincarnated into a new fruit to be
eaten when the user dies. This means, for instance, that Law knew exactly what
fruit he had before he knew how to use it. There are records and second/third
hand sources stating what some fruits can do. That is exactly why he knows
that you can make someone immortal with it despite having never done so. For
our repeated example, Bartolomeo might know he has to cross his fingers
because he could have read that it was required. This means, of course, that
someone else must have learned it by on of the first two methods and there may
be other unknown uses.

  * Final Note

Devil Fruits do not change during the person's life (with Brook as the
possible exception). A Logia fruit does not itself get stronger as the user
does but the user can get more creative, more practiced, and more experienced
in combat in general. This means that training can't make the fruit itself
more powerful or generate new powers that previously were impossible (only
undiscovered).


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I think if you eat a Devil Fruit and don't know what the power is, you can
discover it by accident or when you're in danger. But there is one thing you
will know you ate a Devil Fruit: because they taste horrible.


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