Assuming you have lasvegascoin-qt running, you have to click on "File->Receiving addresses" and you will see your wallet address
Thanks, i see !
Now , can i mining with RX 470 ?
I don't have one, but I think you could. What you need to do now is to find a "miner" that can handle your card(s) and the algorithm "quark", and learn how to use it

(Youtube and Google are your best friends).