Add magic fields to a single page (not every page)

Hello,

I’m building my first WP site and am using Magic Fields 2 for my custom fields. What I’m trying to do is quite simple (I think) but I just can’t seem to figure it out. I’ve made a group of custom fields that I want to add to one particular page but I can only see the option to add them to every page. Is there something I’m missing?

Thanks.