Can't remember how to change my Facebook cover on my timeline. Can anyone help me?

If you are on an actual computer or laptop:

1. Go to your profile

2. Hover your cursor over your current cover.

3. On the right side of the picture, a button should appear, reading, "change cover"

4. Click the button. A drop down list will appear, listing the options a) Choose From My Photos (if you have already posted the picture you want on your Timeline) b) Add Synced Photo (use if you sync photos from mobile to Facebook, would not recommend) c) Upload Photo (if you have the picture saved to your computer, and not already posted to your timeline) d&e) for repositioning and removing, respectively, so these are of no use to you at the moment. From here, depending on which option you choose, it should be fairly simple to figure out how to change the picture, as it is fairly straightforward from this point. Hope this helps!