Yes, you can easily upgrade to a bigger VPS plan through your Customer Control Panel. Simply go to the administration of your VPS, click on “Manage” and select “Upgrade VPS” from the drop-down menu. The next steps are explained there in detail. Should you wish to switch to a smaller plan, it is recommended to purchase it through your Customer Control Panel, transfer all data from your existing VPS to it and then mark your VPS for cancellation.