No sound from speakers

I need help trying to figure out why I’m not getting sound from my speakers, with the stock radio it comes out of static with faint radio signals and sometimes works well, but when I threw on an aftermarket stereo I can’t get any sound to come out. I’ve been told to check for a bad radio fuse or audio fuse but I have no clue which fuse box or what fuse goes to the stereo, I have a 97 528i if anyone is able to help me identify where the fuse is with a picture it’d be very helpful or any advice on what else I should look into other than my amp being bad.