How to get to waypoint icons menu: Open Left Main Menu → Settings → Waypoint → Icons.
Description of waypoint icons settings items (displayed after clicking on three dots in the top right corner):
Add new setting - adding a new waypoint icon with a name.
Add from directory - adding a new waypoint icon from png or jpeg images.
Reset to default settings - resets waypoint icons to default settings and deletes changes.
Delete all settings - deletes all icons even the predefined ones.
Besides these settings, one can change already existing icons by: