Electronic VAT filing

Where do i obtain the information to allow submission of VAT straight from QF?
IE: Password-Branch ECT??
I am registered on the Gov gateway,and can file from there.

The details are given to you when you register for online filing. You should be able to find them all on the HMRC website once you have logged in.

It’s basically the credentials you use to log into the Government Gateway. Regarding the branch number, see here (it’s usually set to 0).