In your admin panel click Users then
Sign up.
You will be presented with a list of product catagories. You then click the arrow for the required catagory.
If you want to pay by VDC, then place a tick in the VDC box at the top of the page, at the end of the signup process you will be then asked to put in your VDC pin.(We would need to have a direct debit for VDC setup to use VDC)
If you do not place a tick in the box then you will be asked for the card details.