If you pay your VAT quarterly by direct debit the sign-up window has closed for the 7 August (30 June quarter) submission. Do not worry as HMRC have announced that you will not be penalised this time so you may file the old way and come back when the direct debit has been collected to sign up in time to file the next return.
Although HMRC will not penalise you, they will send a letter telling you that you missed the deadline and asking you to take action.