I was baffled re: the URL part of the creation of my account (I clicked around confusedly trying to figure it out for quite a bit), if this should be the case for you, as well, a helpful pointer:
Just put the name of your shop or whatever you’d want to be associated with – whatever you’d want people to type into their internet browser to find you. It’ll be your address, basically.
So simple, I suppose… but to me, it was not obvious at first.
Perhaps, to some of you, it would be, and, good for you! Glad for you. But, for the rest of you/us, who would wonder what @$#!# URL (like me)? You are creating your own URL – so, your Etsy shop name is probably what you want to enter…
Mel