Trying to edit my account a little but cant figure out how to add photo under my name lol

Looks like you got it figured out. Keep in mind there are rules for the size of file you can use.
The maximum allowed size of an avatar is 50 kilobytes.

idk even know how to check the size lmao

Dont forget to click the "edit signature" button before you exit.

If you're on Chrome, right click the image and select Inspect Element, then hove over the url: https://i.gyazo.com/5e0b7b9fd446fa04d3fdb75aaacc7fcf.png

Or, if you have the image downloaded, right click it and select Properties and look at the Size property