When you have set your Pi up for SSH on port 22, and you click on "Connect" on the Device List, after a few seconds you'll get a popup window. In the middle is a string you should highlight and copy.
It will be something like this:
To use this as part of an SSH command line (e.g. Linux or Mac terminal window), type the command like this:
$ ssh -l pi proxy7.yoics.net -p 38138
pi is the username,
proxy7.yoics.net is the host, and
38138 is the port.
If you are using an SSH client, then the first part (before the colon):
should be entered as the "host name" and the second part:
should be entered as the port.
After you log in, you'll probably see this message:
The authenticity of host '[proxy7.yoics.net]:38138 ([188.8.131.52]:38138)' can't be established.
ECDSA key fingerprint is 7d:36:98:f2:5a:d9:6e:d3:11:57:bd:d2:f9:30:a8:e9.
Are you sure you want to continue connecting (yes/no)? yes
You should answer 'yes' here.
Warning: Permanently added '[proxy7.yoics.net]:38138,[184.108.40.206]:38138' (ECDSA) to the list of known hosts.
You will get this message each time you reconnect because the address you are given changes each time you click on "Connect" at your Device List.