Having a great looking profile is important to show others that you know what you're doing and what you're all about. One key piece is your profile banner photo. Here's how to add one:
Head to your profile page. You can get there by clicking on your profile picture in the navigation and then "Profile" in desktop.
2. Next, click on the "Update Banner Photo" button in the top right area of the page.
3. Upload your image. Ideal specifications / size for the image are 2560 x 320px.
4. Use the rotate, shrink, and expand functionality combined with directly dragging the image to position your profile banner photo as you see fit.
5. Now, you're a superstar.