Step 1. When you are in the dashboard, click on "VAT Rates".
Step 2. Start by clicking on "Add VAT Rate"
Step 3. Select the country you want to set VAT rate for.
Step 4. Select "Store Wide Tax"
Step 5. Type the VAT / Tax rate for the country you have selected and click submit.
Optional Step 6. Repeat step 2 to 5 if you want to add multiple countries.