how do you add a title to "theatrical visits"?

[sk33tr]

i've noticed several users have movies in their "theatrical" lists.

i was wondering how you do this.

when i click on the theatrical link while in my profile, it tells me:

You currently don't have any titles in your theatrical collection. To add a title, simply go to the movie you wish to add and click the "Add to theatrical visits" button below the cover.

but when i go to a movie, i don't see the button it's talking about.

any help with this?