Start by logging in to your account on the web app.wehuntapp.com 

1. Click on Hunting areas in the left-hand menu and select the relevant hunting ground
2. Click on Map in the left-hand menu
3. Click on the down arrow above the map
4. Check the boxes for the item you want to export
5. Click Download to download the file in GPX format to your computer

To be able to export something from your hunting ground, you need at least the subscription Standard.