There may be times that you need to have a specific menu disabled or enabled due to relevance.   In order to keep the menu intact, but no longer visible to the reader,  you will be able to disable/enable the Menu.   As such,  there may be a time that a previously used Menu is needed and you need to enable a menu that was not previously used.  This is easily done in PSB using the steps below.

While logged in to your website, go to Manage, then Structure, and choose Menus from the options listed.   From there,  choose which Menu option you need to make changes to.   The example below uses the "Quick Links" Menu, although this process will work with any of the menus listed.   Navigate to the Edit Menu screen where the menu link lives and click "Edit Menu"   Click the check box under the “Enabled” column on the Edit menu screen beside any menu link.  Click “Save” and you will be taken back to the website and see a confirmation message.