After activating the service, you will receive an activation email with the details of access to the server. For servers with Windows OS, you can connect using the RDP protocol (Remote Desktop Connection), for servers with Linux OS, you can connect using ssh protocol (using for example the putty utility).
If you have lost access to your server, then you can go to the control panel of your server by selecting your service in the billing and clicking “Go”. In the window that opens, select your server and click VNC for virtual servers and “Server Settings” for dedicated servers from above.