While I normally use part of my email as my username on sites, I didn't expect it to do that. Is there any way I can change my username?
Yep, you can definitely change that around. Click on the picture or letter in the upper right (your avatar) and then click on the Preferences menu. You can then click to change your username (assuming it's available). Let us know if you have any trouble.
Ah, yep, that worked. It did display this message though, so it's probably best that people do this right away if they want to change username:
That worked for me too, thanks!