Just in case no one has figured it out, the advice to right click on your name and click "Copy Spotify URI" is correct. However, to be more specific, you can NOT do it (at least I couldn't) on the website, you actually have to log in through a downloaded app. That's the only way I was able to do it, and it seemed to work.
.. .hmm, hi! I'm super new here!!!! .so please, would somebody give me a step by step solutions on how to find my user id and how to change my profile picture without facebook..... Thank You a Lot!!!!!!!! Please help me... hahahaha