it's say that my imput is invalid, very strange, i'm sure i've copied my private key in a right way
First- Unlock the client: walletpassphrase [youpassword] 600
Second- Import the private key: importprivkey [yourprivatekey] [Titleyouwanttogiveyournewaddress]
Then you have to wait a bit. and after about 2 minutes depending on the speed of your computer you should go to
addresses and your new address should be there with the title you inserted when you first imported the private key.