I set up wrong ETH deposit addess in ethminer. I mined about 0.23 ETH already over there. I am using nanopool eth. Is it possible to change this address to new one to withdraw money somehow?
You can start using your new address, just change it in your command line when starting ethminer. As for what you already mined, if you don't own that wallet I don't think there is anything you can do. The administrators of nanopool could possible help you, but with no real way to prove that you were the one who mined it, you might have a hard time getting the eth.
I can prove because there was my email and my nicknames as rig machines... waiting for reply but still no answer from them...