Legend is like a category or container of location types, in a geographical map context, a map legend describes all the signs and symbols you would see on a map.
1) Legends area in JoomMap directory
2) How to create legends
Login to Joomla backend , go to JoomMap, then click on "Legends" in sidebar menu, click on new green button to add a new legend.
3) Assign legends to location types
Each location type should be attached to a legend, click on location types in sidebar menu, then edit your location type , choose legend name in "Display in legend" option.