How to install round brake pads
You got the wrong pads.

While it's possible to mix and match some pads, this is usually not the case. When replacing pads, keep track of:


Pad material and what your rotor is compatible of. Some rotors have a "resin pads only" etched on. Consult user manual or manufacturer website for this info.
Pad shape. Note the features, like "handles" shape, amount and location of holes and protrusions.


The pad you want has is called DBP-01.23R. It's a Shimano-compatible (B01S analogue), very wide spread model, you should be able to source a pair from any half-decent bike shop. The round pads are for Promax Render and Decipher and won't work with your Solve.