You can easily upgrade your plan with steps as follow ;
1) Login to billing portal at https://billing.aseohosting.com
2) Click the Service tab then it goes to My Products & Services page
3) Click the line for the account/plan that you would like to upgrade
4) You will see the "Upgrade/Downgrade" link at left navigation menu
5) Other plans will be on the this page, please pick one of the plan that you would like to upgrade to and cllick on "Choose Product" button
6) Please prooced payment steps and complete the payment.
We will receive your upgrade request once you completed steps.
Our provision department will add new IPs to your account and you will receive an e-mail with the list of new IPs.
Please submit a ticket if you have trouble with above steps, please do not forget to add how many new ips you need..etc