This article is related to PromoteMyPlace Version 2 only. Not sure which version of the application you're using? See Which version of PromoteMyPlace am I using?
From the ‘Website’ dashboard, choose ‘Trash’
Find the page you wish to restore and select ‘Actions’, then Restore’
A pop up will appear to check that you want to restore the page. Select ‘Yes, I am sure’
Go to ‘Pages’ and the page should reappear in the pages list
If the page was linked to a menu item the menu item will not automatically be restored so you will need to add that back manually. See help articles for menus.