Go to the Space Admin tab of the Browse Spaceview. To do this:
Go to a page in the space, open the Browse menu and select Space Admin. Space Admin is displayed only if you are a space administrator for that space or you are a Confluence system administrator.
Click on Trash from the left panel. A list of deleted pages and emails for the space is displayed.
Click on the Restore link beside the page you want to restore.
Note
If a new page has already been created in that space with the same name as the deleted page, you will be given an option to rename the page before it is restored.