This is a test profile page so you can automatically login using Test User and explore the site and functionality.
1) To add a cover photo - Go to your profile page and hoover over the upper right corner of the cover photo and click edit then upload your photo from your computer. After you've done that, left click on photo to move it where you please then double click to finish.
2) To change the overall look of your profile go to your profile then in the actions box and click customize. There is a help page on how to customize your profile page. Go to the main menu, then go down to help then look for Customize Profile.
3) To edit your Profile Info that others see/read while in your profile simply go to your account and click Edit Profile from the quick links box.
4) Add or change your profile picture (avatar). Go to your account and click Avatar from the quick links box.