Every free VPS client got 2 IPs: dedicated IPv6 and shared IPv4 with dedicated port for SSH.
For most tasks you should use your IPv6 IP. You may find your IPv6 IP address in client area, under My Servers tab on the right sidebar. For example IPv6 address is: 2a02:4780:1:1::1:3a6
To find out your shared IPv4 and dedicated port for it, go to My Servers tab and choose SSH section.
You will be able to see your shared IP and port like this:
ssh [email protected] -p 2204
For this example, your server shared IP would be: 18.104.22.168 and dedicated port for SSH is: 2204