Personalize this Page

 Please go to Central Admin site -> Manage Web Application -> select the web application -> User Permissions on the ribbon -> enable “Add/Remove Personal Web Parts” and “Update Personal Web Parts” in Personal Permissions section.

Since personalization is a concept on web parts according to Key Concepts in Personalization, “Personalize this page” option is only available on web part page, we don’t have this option on wiki page of a team site even if we enable this permission for users in Central Admin site.  You should check user permissions for your site. For users to be able to use "Personalize this Page" they must have the following base permissions:

1. Add/Remove Personal Web Parts
2. Update Personal Web Parts
3. Add and Customize Pages

Ref http://social.technet.microsoft.com/Forums/en-US/sharepoint2010customization/thread/988588fd-548f-4f3a-a0ac-c7bb72b5dd53