To choose a profile photo, (called an Avatar) go to My Stuff, Manage Photos, then, beside the one you want to use, click Set As Avatar.
For future, keep in mind that photos marked "M" can not be used as Avatars!
Isee that you've got the avatar done. Now root around in the "Casting" and "Browse" sections and contact photogs in your area whose work you like and offer a TF shoot. Don't wait by the phone. Do it yourself.
Lastly, stay away from the tattoo dens, zap any email that says (with poor grammar) they want to pay you $$$ without being specific on the city, date and subject, and avoid clunky shoes. You'll do fine.