I am newbee to chat also, not only to bitcoin, so, I don't understand how to register and use bitcoin-otc?
their userguide is for experienced users, I don't know how to find gribble and how to register to be able to trade?
You just have to type /msg gribble command-here
I know how to generate gpg keys and how to upload to some server. but this gribble is problematic for me. and will this gribble show my real IP address?
Yes, as will IRC, itself.
if yes, how to register with proxy? if gribble is webbased chat or something like that, then I can change proxy settings in my web browser. if it is some software, I hope I will be able to hide IP.
For that, you'd want to look online for a guide that tells you how to connect to freenode with a proxy
. If I recall, it requires you to initially have someone register an account for you before freenode will let you connect behind a proxy. I know its been mentioned on the forums here before, too, so there's a good starting point.