Navigate to your profile by either clicking "Profile" in the left-hand navigation or from the drop-down menu in the upper right.
Click the blue "Edit my Banner" button that appears in the upper left corner of the banner space when you hover over this section.
On the next screen, click the blue "Upload" button to add a banner image or update the existing banner with a new image.
Browse the files on your computer for an image in JPG, PNG, or GIF format by clicking the "Browse for a File" button, or simply drag and drop the file onto the rectangular field.
Once this is completed, click the green "Save" button at the bottom of the page.