Keeping your photos up to date is a great way to refresh your profile.

Whether you want to edit an existing photo (update the caption, adjust the thumbnail, etc), or delete the photo to make room for a new one, it's all done from the same place. 

1. From your profile, select Upload Photo.
2. Select the uploaded photo, and click on the Edit or Delete icons
3. If the photo is the only one on your profile, you won't be able to delete it and will need to replace it in order to remove it