how do i change my background profile image on twitter?

[Sarah]

Maybe it's the image you are trying to upload, just to check try uploading a working background from here: http://www.glosslife.com/twitter-backgrounds

Follow the instructions at the bottom of the link I gave you.

Sometimes you click the save button and don't see the changes immediately, so try refreshing twitter by opening your timeline or profile page to see if the background change was applied.

Good luck!