All about linking menu items
Within 'Main Menu' and 'Submenu' widget options, there's a section - 'Linking - More Info' for easy reference on linking menu items.
To apply links to menu items, within the widget options, in 'Menu Items' section, select the number of items you want in the menu, and menu item text. You can also choose to open link in new page.
Linking Internal Pages - if the page name is 'About Us', the link would be - ./about-us.html
Home Page is always - ./index.html
Linking Anchor Points - if there's an anchor point called 'our_team' on 'About Us' page, the link would be - ./about-us.html#our_team