Hi and welcome to Arturia forums.
FYI: You have posted in a controller forum. Your question is about the application Mini V3.
Select your controller as Midi device in Mini V3s Audio and Midi settings in the applications menu, just like you can read in Mini V3s manual in section "2.2 Initial setup".
It's the same procedure for all Arturias applications.
If you mean in a DAW, then please search for posts about this, as that just is a setup for the DAW.