An IP address is a set of 4 numbers, separated by full-stops,
It uniquely identifies your computer at a given point in time.

If you are using a dial-up internet connection, your IP address
will be different every time you connect.

To use PSST, you will need to know your IP address, or the IP
address of the computer you want to connect to

If your computer, or the computer you want to talk to, are
reachable at a fixed domain name (such as through a dynamic DNS
service), you can use the domain name instead of the IP address.

At this point in time, your current IP address appears to be

18.189.7.216, 18.189.7.216

You should best click the 'Refresh' button on your browser though,
to make sure you aren't seeing a cached copy of this page