say you are in a band or in a random shot at a show.
First, log into the site.
Next, when you click on a concert and then a band and are viewing the pictures in that little pop up window
click : [Add To Profile Pics] (which is located under the picture)
bazzing!
and it will add it to the pictures in your profile.
you can also add this to your favorites list on your profile page by clicking
[+ favorites] (which is located under the picture)