Go to Appearance -> Menus and click on create a new menu option. Give it a name, (like “Main Menu”) and click on Create Menu.
A new tab tab option, Manage Locations should be visible now.
Edit your Menu by adding elements from the left side of the page. When you are done, click on the 2nd tab, Manage Locations, select the menu you just defined and click Save Changes.
The menu should now be visible on the front page.