Are you wondering about that huge white banner across your profile? Is it a bug? Well, no it isn't. You can place a banner of your choice there! It's very easy, so just follow these steps and you'll be good! Note: .gif files do not work for this!
Alright, to start off, go to this directory: Profile > Edit Profile > Personal Then scroll down towards the bottom of the page, and you'll see Cover Photo which has a blank text field. Place the link of your desired photo and you're good to go!