Your app comes with a menu on the side, accessible by clicking the three lines at the top. To set up the menu, click “Configure App Menu.”
You can drag menu options up from the bottom of the page to the menu on the side.
For external links, choose “Custom Links” and drag the “External Link” to the menu. It is recommended to paste the full address to the link, then to edit the link and opt to open it in a new window.
Save the menu when completed.