At Export, choose 'mapping'
When you get into the mapping screen, first make sure you have selected 'all fields' in the top dropdown.
Type over the 'all fields' to the mapping you want.
Use 'clear all' to delete the mappings.
Choose the first (organiser) field you want to map on the right and click on the left field 1. Nothing will display.
Now click on the left field 2, field 3, etc. untill the line displays.
Thereafter you can map further fields by clicking left and then clicking right.
You can re-assign map links, but you can't delete them unless you delete them all (clear all).
After the mapping has been made, click 'add' which adds the name you typed in to the mapping list.