Hi SteveK,
I actually called the number and the man I spoke to told me.
Go to the main page and You'll see "Vorbestellung / Pre-order", this link is an e-mail form where you can fill out your address and check off what you want.
At the bottom of the form it says: You will receive a Pay-Pal invoice as confirmation for your order. I hope you have PayPal.
It drove me a bit nuts because the site will not let you right click and I don't have Outlook or other email apps on my PC but I was successful on my Surface Pro since I do have Outlook on that.
Anyway, I'm sure a regular email will do. Just send it here:
contact@imcosys.com
Again, give them your address and fill this bit in:
__1__ imcoV6L (Backcover Purple)
____ imcoV6L (Backcover Black)
__1__ Leather Cover (Schwarz)