An airline hub or hub airport is an airport used by your airline to concentrate passenger traffic or used as a sub base for your airline operations. Pilots can use Hubs as their base of operations as well.
An airline marker is a map marker which will be displayed in the Airline Map/GPS.
Go to the Crew Portal and select "Hubs & Markers"
You can view your hubs on the top section and markers on the bottom
Click the Add a hub button and fill the ICAO code for the airport.
Select the Add a marker button and fill the Label, Latitude & Longitude and the Custom Map Marker URL which will be used as the marker icon.
Hubs can not be modified. Simply delete the hub and re-create it!
Select Edit in the marker you'd like to edit
Select the Delete button on a hub to delete it.
Click the Delete button on a marker to delete it.