How do I know my account URL?

Hi, I have a fully paid subscription to Articulate 360. I wish to publish a Timeline slide from Articulate Storyline into Articulate Online. From there I can try and insert it into an Articulate Rise Course. However, it asks for my account URL. From the notes above this is something I may have set up myself when I initially subscribed 2 years ago. I cannot remember what my URL is, nor are any of the instructions above useful in telling me how I can find/re-find that URL. Can someone please advise.