Add a Menu Link
Navigate to the desired page
Click Edit
Select the Menu tab

Check the Provide a menu link box

Complete the Menu Options
Click Save
Edit a Menu Link
Navigate to the desired page
Click edit
Select the Menu tab

Edit the Menu Options, as necessary
Click Save
Remove a Menu Link
Navigate to the desired page
Click edit
Select the Menu tab

Uncheck the Provide a Menu Link box

Click Save
Menu Options

Menu link title: The text for the menu link
Description: A short description of the page
Note:
This text is shown when hovering over the menu link
Parent menu item: The link under which the menu link will be