Hi and welcome among us @MIIDDY.
Could you please use the search bar next time before creating a topic? This question has been answered several times and we try to keep the forum coherent by avoiding redundant threads.
Before minting : you can’t change the category. It’s a bug, but the Rarible Team is working on it.
After minting : a NFT is immuable so you can’t change anything on it.
By the way, your music is so dope!
I wish you’ll find your way here.
My NFT here and my profile here
I always follow for follow, even on instagram where you can see my other pieces and my painting process.