SFTP

how to connect to the server via SFTP if there is no ip

You need to provide the server address, you have it in the email with the service details.

admin namely , where can you tell ?

Correct message after entering an address in the browser. Please refer to the help section:
https://docs.serv00.com/SFTP/

admin so to log in via SFTP, you need an IP

Spaceeee No... s0.serv00.com.