u/Emergency-Insect-503

I just installed retro arch on my laptop and was run in a ds game but when I try to remap the controls it doesn’t let me change it from the same few keys. Like I can’t register anything to the “j” key if I wanted to, it has to be some variation of the arrows or a,s,x,z and a few other things. I was wondering if this is just how retro arch is with computers or I’m doing something wrong.