Welcome @pyrockstar29433, I hope your down time is healthy and healing! I'm also brand new around here and found changing my profile picture and username less than straightforward. But I did figure it out and thought I might be able to help you.
I had no luck in this section (the Q&A forums). Navigating to settings through here allowed me to change my cover photo, but neither my profile pic, nor username (which wasn't as bad as yours ).
Ultimately, I had success by navigating to "My Account" by clicking on the icon photo (in the upper right corner) from the actual course exercise page I was working on at the moment.
From there, I clicked, "My Account" and then scrolled down to change "username" and "profile picture".
Good luck with your coding!