>Do have tried the walktrough at "Help" (in the upper right corner) -> "Report a problem" ?

This is a little bit different than the French server but ends up in the same pattern. Once you proceed, there is a Yes/No. If we press No, there is a field to enter a text. But, this is quite general and there is no field to enter the email. IAC, I have send something using that on the French server.