BEFORE you can add a new menu item - you need to create the ARTICLE the MENU should link to.
1. Go to MENUS > MAIN MENU > ADD NEW MENU ITEM
2. Title - Type the TITLE of the menu item (leave Alias blank)
3. Click on the blue SELECT button next to MENU ITEM TYPE
4. Choose ARTICLES > SINGLE ARTICLE
5. A new box will open "SELECT ARTICLE* " - Click on the grey SELECT button. Choose your article that the menu should open once clicked on
6. SAVE your work