Step1. Login your client area http://billing.host4asp.net. Under the Services menu, you can see a View Available Addons option.
Step2. Click View Available Addons options and you will see a lot of addons in the list. Here, I just list a few as below.
Step3. You can choose a needed add-on product and click Order Now. As soon as you complete the payment, you can enjoy the new add-on service.