The profile is Private so you will need to do the edit. If you've already uploaded the image, go to the Images tab on the profile page and then click on the image you want as the Primary image. Scroll down until you see
Set as Primary Photo
on the right side of the page. Set the checkbox and click on "Set Primary". That should make it the image you see. If you want to remove the old one, follow the instructions in the FAQ which has a link at the top right corner of the image page.