Editing the parameters of running servers (webserver configuration, database....) is in competence of the server administrator = customer who ordered VPS (or a person entrusted with its administration). Before you take any action, we strongly recommend to do the backup over the PowerPanel, and only then start to experiment. With a backup, it is easy to restore VPS to the initial state within few minutes in case of any mistake.
Restore is done from same interface as the backup. Select the required backup (VPS Profi includes the possibility of acquiring 3 independent full backups, VPS Basic only 1 backup).
The VPS will be stopped before its restoring.
The whole action can take several tens of minutes depending on the size of the backup and load of the hardware node (in case of gigabytes backups).