Filed my July vat but no box showing for august

Help filed my VAT for July and submitted. But no box showing for august wont be able to file that quarter with out it

The open periods come direct from HMRC, I’m not sure when they start offering you the next period but if you’ve just filed a return for the quarter up to the end of July then your next deadline isn’t til 7th December (for your August to October quarter) so it’ll probably appear nearer then. Right now it’s just a couple of days until the 7th Aug filing deadline for the Apr-Jun quarter so I suspect HMRC’s systems will be quite busy with that.

Thanks for the advice I will give it time.