Under the Develop menu tab, you will see a menu called
Clear Menu Cache.
Clearing your menu cache will update the menus to reflect any changes you have made. Menus are cached to improve system performance by alleviating the need to fetch the menu list from the database for each page view. The downside to this approach is that changes to menus aren't always immediately reflected. Logging out and relogging in will also clear the menu cache, so users will always have the latest menus when they log in.