hi! @
SmallArtist:
that's not a dumb question at all! you can change your profile picture by following this path:
first, go to account on the navigation bar [the bar right below the clan buttons] and click account, and on the dropdown click 'edit profile'.
next, look to the left of your screen and you should see something that says 'edit avatar', click that. [it should be under the category 'settings and options']
lastly, you should then be able to change your profile picture on that screen! let me know if that works. <3