@aprilish @Jessica.C I’m afraid to say that your background edits cannot be done.
Currently, the editor I use is acting up whenever I try making them. It starts lagging, and sometimes it mixes up the colors/textures. Due to this action, background edits cannot be done anymore, and I’m so sorry.
@MysteriousAcro has a thread that can make you background edits here
Yet again, I’m so very sorry.