Why can I not change Particle System settings anymore? I'm kind of new to Blender, so this might be a really easy question to solve - I just couldn't find anything on the internet so far.

I created a particle system and already changed the settings to how I wanted them to be.
Now I want to change the lifetime of the particles (make it longer) but I can't figure out how. When I try to do it how I did it the first time, it doesn't work because the setting panel seems to be 'blocked' or so (see picture).



When I select the Particle Setting specifically, Blender tells me that it is not yet implemented.
That's because you have baked data. Simply press the Free Bake button under the Cache section, and you'll be able to edit your settings; you will have to re-bake, though.