Why can't I make a signature? Or if I am being an idiot and can but don't know how, then please let me know how to make a signature.
It's not you. The signature function is currently inoperative, and it has been talked about in the past. It's still on the list of things to look at.
A lot of things have gone on in recent times and restarting signatures is not the biggest concern. Yes people want them back, but please be patient.