The Properties button in the Page Actions Toolbar near the top of the page contains information about the page. You must have the page checked out to you to see all the options.
MultiEdit Content is where you will set up the main page image if you are using a Feature Image. Select the MultiEdit Content option from the left menu in the Properties screen or by using the orange MultiEdit button at the top of the page edit screen. These options will be different for a Profile Page.