There's two ways you could do this:
1. You can sweep the funds (send the funds from the first address to the second one by doing a transaction).
Pros: Safe, gets rid completely of the first wallet.
Cons: Transaction fees.
2. You can import the private key from the first wallet to the second.
Pros: No fees, control over the funds stays the same.
Cons: Less secure because you are manipulating the private key and not included in second wallet backup.
this I know but the part I didn't understand is where do I do the transaction? When I generated the wallet on the web where does the transfer done? is there a website to access the wallet I generated or what that the part I didn't understand
thx
You can do it with bitcoinjs-lib :
https://bitcoinjs.org/But i suppose that you don't have any coding skills, so you should consider one of these solutions :
1- Import the private key of the address you created in bitaddress.org at bitcoin-qt (the core wallet) :
http://bitcoin.stackexchange.com/questions/5941/how-do-i-import-a-private-key-into-bitcoin-qt2- Import the private key of the address you created in bitaddress.org at blockchain.info :
https://blockchain.info/wallet/paper-tutorial3- import it into your phone using bitcoin-qt android/ios wallet : just scan the Qr code of the private key, like for blockchain.info