Using a Pre Rendered character as the player

I havea character pulled from the unity Asset store. Hes been placed on the map but im looking to set ims as the playable character in rue of that goofy guy with the wrench.

im new to this program so im still unfamiliar with how the mechanics of it work.

Any help would be greatly appreciated since i'll need to know this when it comes time to actually MAKE my own game from scratch.

Thanks!