As I said earlier, send a check made payable to the 'Commissioner of Motor Vehicles', but do not write the amount.
and how do I renew if My registration is about to expire?
It is very easy. You can renew online up to one year after the expiration date. You can download and print a temporary registration that is valid for 10 days on the day you renew.
And how can I do if my address is not the same as when I gave the data?