adding features to my current website

I have a website i am currently working on, its via one of those do it your self websites. As always, those websites are limited on their offerings. I need to add a pop up page to make sure they can see my terms and conditions, as well as a private policy. Also a paid member log in feature, where once they have paid they automatically have access to the protected pages, with out me having to manually adding them. And lastly, a media form for people to meet with out sharing private contact information.