On the vehicle page on the right-hand side, you will see a breakdown of the price. The payment is always 15% prior to arrival and 85% on arrival. It will look like the below image:
Click the Add to Cart button on your selected vehicle's page
For the Insurance Deposit, click the 'more information' Hyperlink underneath the vehicle image. Once the pop-up screen has appeared, scroll down a little and you will see 'Insurance Deposit Procedure'.