Build Content management for simple website -- 3

I need content management with admin able to manage from back end. Simple site with user log ins. First page-Users will post questions and reply them. Similar to youtube review posts Second page- profile page where users can edit their profile Third page- contact us with a form that I will give the design (admin able to edit) Fourth page- about us (basic information) And the admin should be able to add a new page with basic text and images Admin should have the word editor to post any information. For the design please see: [login to view URL] I will give the html designs More info during assignment