Can I display my VAT number on my website?

You can display your VAT number in the following places:-

1) On the contact page of your website

You can simply add it to the text of your contact page
To do this, go to "Page editor" in the website manager, then click "Edit pages" and edit the contact page

2) On order confirmation emails

To have your VAT number displayed on order confirmation emails, go to the "Settings" section of your website manager, then click "General settings" and go to the "VAT (sales tax)" tab
In most design themes this will also display it in the footer of the website on every page