my actual problems are:

I can't change my "Rudi" profile anymore. When I try, I get the message: the email-address is already used by another member. And so I can still post under "Rudi" - but I can't change the profile, and I can' "automate" Rudi as the "sender".

I have still my second name "IDUR" with another email address (the yahoo-one).

I thought that one of my options would be:

free my yahoo-email-address for "Rudi", by giving IDUR an "out of space/imaginary email-address", and then changing Rudi's email address to the yahoo-one (but chosing the no-show-email-address-option, because I prefer to get emails on my longterm traditional email address). But I can't - when I try now to give IDUR an imaginary email-address the system responds that I try to hack around...