You give rights to a minisite or the site overall, not to a page. A minisite can have only one page, but that's not really a great way to manage things.
In SLS1, the "Right" button was on the page, making it appear like you were giving rights to that page. In reality, you were giving rights to the whole minisite. SLS2 works the same way, but you need to give rights by logging into the Minisite Center, and using the Tools tab.
To login to the Minisite Center, click a Minisite and click Manage Minisite
After you are in, select the Tools tab on the right and then Manage Rights.