Login to facebook; Select the page for which you want to share rights from pages list.; Go to settings tab (near help);
Login to facebook
Select the page for which you want to share rights from pages list.
Go to settings tab (near help)
Select page roles tab
Write name or email id of user to whom you want to share rights and then select the role(editor, admin, moderator, etc)
Once done, click on save button and verify through password.