Is there anyway we can leave a feedback without the URL? It wouldn't accept my pm haha. I don't have a URL as I bought something through pm'ing the person. I just want to leave a feedback of my experience. THANKS.

There are a few ways you can do it.

1.) Go pick any buying/selling URL and stick it in there, even though it's blatantly the wrong URL.
2.) Create a WTB thread and in this WTB thread, just go ahead and make your title "Completed, please lock."
3.) Don't worry about feedback at all.

I'm guilty of doing all three haha