How to Restrict Access to Members, or certain Members/Groups

On the Admin Panel Pages > Add /Edit Page sections, you can set any page to be Restricted Access for only Members and/or Member Groups you choose - just select the members and/or member groups you want to have access to that page from the Groups menu and the Members menu there (dynamically populated by the latest members/groups). If you choose the "All" option on either list, any visitor will have access. If you choose the "None Set" option on both lists, any visitor will have access.

Manage Members and Member Groups directly from your Admin Panel under the Members tab.