Get your taxes done using TurboTax

I certainly have no idea what you did.

Paying for the software isn't paying your taxes... I don't know if you can arrange a VA balance due payment when you file, or whether it has to be arranged separately.

.....what you should do is to download your filing copy to a PDF file on your computer, and read the VA Electronic Filing Instructions near the beginning of your VA tax file, and see what it says about how your 2018 Payment to VA is going to occur...or whether you still have to arrange that payment separately.
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IF your payment has been scheduled it will be stated, along with the scheduled payment date...on the Filing Instructions sheet

 IF you still have to arrange it, then there will be directions on where to go to schedule it....but I would recommend you NOT schedule it for 1May....schedule it for a few days before.  Last second payments can go astray...you want it recorded as being paid  a few days earlier.
____________*Answers are correct to the best of my knowledge when posted, but should not be considered to be legal or official tax advice.*