I can't seem to find this anywhere, though I could have overlooked it so apologizes in advance if that's the case! (I found a link to a profile editing guide but was not allowed access.) How do you add a background photo to your profile? >.< I can't seem to figure out how to do it. Thank you!

Try this guide maybe? This is what I have for mine:

This is where you edit your profile

Thank you so much!