You can edit the CPU and RAM resources for all Virtual Servers. Depending on the OS it is built on, some VSs can have their CPU and RAM resized without needing to be powered off ("resize without reboot").
After changing the Virtual Server resources you can see two prices per this Virtual Server per hour, depending on VS power status (on/off).
Please pay attention that when you resize a VS, the price is changed, and the new price is not applied immediately. It takes about 5 minutes to take effect.
If the VS template allows resize without reboot, the resize should be completed automatically: you will be returned to the VS details screen and see a message indicating the resize was successful. If the template does not allow this, you will be asked to confirm that the VS will need rebooting so that the resize can take place.