If you just enabled your Timeline and want to edit your cover image then you landed on the very right page. Check out the simple tutorial on How to change your cover photo on Facebook Timeline, after the jump.
Login your Facebook account and Open your Facebook Profile [Timeline].
Now take your mouse to the left bottom of the Cover (hover the pointer) as shown in the image below. “Change Cover” button will appear there.
Click on “Change Cover” then on “Upload Photo” and select the image from your computer.
Drag and Reposition the image according to the space. Now click on “Save Changes”.
Size/Dimensions of Facebook Timeline Cover Photo:
The exact dimensions of Facebook Timeline cover photo are 851×315 pixels. Resize or Crop your image to the exact size, if you want it to look perfect on your Timeline.