Entered the wrong vat quarter dates. First time set up. How can I change this?

Let's change the starting period of your VAT, jo26!

You can follow these steps:

1. Go to Taxes and click the Edit VAT drop-down in the upper right-hand corner.
2. Choose Edit Settings and change the Start of current VAT period.
3. Click Save.

You can also check the article about VAT for your additional reference: VAT Getting Started.

If there's anything that I can help, feel free to post back.