In order to upgrade your VPS follow these steps:
1. Login to the Clients Area;
2. At the left menu, select «My Services > VPS» tab;
3. Find desirable VPS and press the «Manage» button;
4. On the left side find button «Upgrade» and press it;
5. Select package and billing cycle you want to change to;
6. Press on «Continue» button;
7. To end upgrade press «Submit» and invoices will be issued.
Attention #1: Billing cycle dropdown menu shows full prices. The difference you will need to pay will be calculated only after pressing «Continue» (6th step above).