Follow these steps to add custom navigation links to your FMX sidebar:
1. Log into your FMX site.
2. On the left side of the page, click on Admin Settings.
3. From there, select General at the top and from the drop-down list, chick on Custom nav links.
4. In the top right corner, click on Add link.
5. Fill in the Name, Icon, URL, Menu location, Order, and Permitted User Type. When finished, click Save.