As for signing messages... that is pretty easy in Electrum: "Tools -> Sign\Verify Message"
Short version: Type your message in the top box, put the address you want to sign with in the middle box, click "Sign"... you'll get the cryptographic signature in the bottom box.
shorena created a VERY detailed tutorial here: https://bitcointalksearch.org/topic/m.10775516
thanks again!!!!!
I've signed my message and send a pm to the admin! Hope to get my account back!