OK - start with the USB/Images Tab,
change to "Manage Partitions"
There choose your device and then the number of partitions (e.g 4).
Then apply the changes.
Next make right click on the first part and say: "create swap part"
Thats it!
Choosing what image to boot:
when you turn on the box you'll see "Kathrein UFS 910" - after 1 second you can choose the image to boot with the cursor up/down of your RC.
But just post your bootargs, I will then explain it in more detaill