To add additional IP addresses to your VPS follow the steps outlined below:
1) Login to the billing and support portal at http://my.h4y.us
2) Select Services > My Services
3) Click "view details" next to the product you would like to add IPs to.
4) Select Management Actions > Upgrade/Downgrade Options
5) In the additional IP field enter the TOTAL amount of additional IPs you would like to have.