The registration for the ASDU European Championships 2017 takes place directly via a registration portal of the A.S.D.U.international.
You can find this on the homepage of the A.S.D.U.international or via the link below. It is activated for you since 20.11.2016.
Following you can see an image of the registration portal:
Registration portal of the A.S.D.U.international
There are an englisch and a german version of the registration - for changing look at the yellow oval in the image.