You can add different link types into your menu, these are split between panes left of the menu you're currently editing.
1. Locate the pane entitled Pages.
2. Within this pane, select the View All link to bring up a list of all the currently published Pages on your site.
3. Select the Pages that you want to add by clicking the checkbox next to each Page's title.
4. Click the Add to Menu button located at the bottom of this pane to add your selection(s) to the menu that you created in the previous step.
5. Click the Save Menu button once you've added all the menu items you want.
Your custom menu has now been saved.