On the Theaters and Showtimes page near a theater's name, click the "Add this theater to My Theaters" link to make that theater one of your favorite theaters. "My Theaters" are always displayed first in your list of local theaters, and will also be at the top of the "Choose a theater" dropdown. If you want to remove a theater as a favorite, click the "Remove this theater from My Theaters" link near the theater name and the theater will no appear at the top of your local theaters.