Registering with AV (AMS) is easy.
1) Run Darkfall client from Steam and click "REGISTER"
|click on Upper Right corner|
Once you finish registration you can now access AMS by going here https://ams.darkfallonline.com/AMS/ to buy Seletine Gold for fluff items, Play Darkfall directly without steam, link official forum account, etc.
You can also get customer support from https://cs.darkfallonline.com/