If you want to join a local community within the European Division, you must have completed all steps for joining VATEUD first. Once you have completed those steps, the rest is as easy as abc.
Something similar to this should be okay:
Dear Membership Department of VATEUD,
I would like to have my VATSIM Account linked to XXXXX vACC. My VATSIM ID is XXXXXXX.
NOTE THAT ALL COMMUNITY MEMBERS MUST AGREE WITH VATEUR'S, VATEUD'S AND THE COMMUNITY'S POLICIES AND REGULATIONS.
Content updated: 15. February 2019.