WP-Members

I would like to know how can i deny access to a single page for unregistered users
Exactly the requirement is i have a page i which there are 5 such screeen shots to the left with a brief description for each corresponding to the right.there is a read more tag at the end of each description when i click on that i would like to move to page with 3 buttons buy ,trial and demo,no w starts the game ,when i click on the demo button it should go to login page after going in it should go to the page where demo is included,my question is how can i do this using a plugin