How to change your cover photo on Facebook on your iPhone?

I don't know how to change my cover photo on Facebook on my iPhone 4. How do I do it?

You can't through mobile

How do I edit my cover photo?

To edit your cover photo:

-Go to your timeline
-Hover over your cover photo
-Click Change Cover at the bottom-right of your cover photo
-Pick one of the options from the pop-up menu (ex: upload a new photo, reposition your current cover photo or delete your cover)
-Save your changes

How to edit cover photo at facebook?

- Go to your timeline
- Click on the change cover at bottom right side
- Select the options from pop-up like{Choose from photo / Upload a photo / Reposition / Remove}
- And save the changes. Its as simple as that.