what does "address" in the wallet mean? does the wallet generate new addresses??? Is it my new bytecoin address?? Is it the one i should use?
Yes, when the first opening the wallet generates a new address for the user
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Once you open Bytecoin Wallet, it will automatically create your first Bytecoin address and start synchronizing with the network.
If you don't need that, just open the wallet that you used before. You've gotta go File - Open wallet, then find it and hit the button and you're done.
Btw if you're gonna come around and and use the automatically generated address, then you better encrypt it: go Settings - Encrypt wallet and create a password (complex one!).