I just Have a question i send meater reading But i dont know how much i have to pay the bill
Are you asking how much the bill is and how to pay.
You should have a dd set up with Bulb, the dd will be constant each month regardless of how much your bill is.
Unless of course you are on a prepayment meter.
If you have just sent your readings you will receive an email with the bill details in a couple of days.