Can I try the VPS administration before its order?

Yes, there is a demo version at:

  1. Linux server:
    PowerPanel - https://vpsdemolin.forpsi.com:4643/
    login: root
    password: forpsi

    Plesk - https://vpsdemolin.forpsi.com:8443/
    login: admin
    password: forpsi

  2. Windows server:
    PowerPanel - https://vpsdemowin.forpsi.com:4643/
    login: administrator
    password: forpsi

    Plesk - https://vpsdemowin.forpsi.com:8443/
    login: admin
    password: forpsi

The demo version compared with a hot version is limited for obvious reasons - e.g. there is impossible access via SSH (Linux) or via Terminal Services (Windows). The access is allowed only through these two interfaces.