Connecting with XChat

XChat Azure is an open-source IRC client for Mac.

From the menu, select File --> Network List....
If your nick name is blank, fill in your nick name with the bouncer username you registered. If your user name is blank, fill in your user name with the bouncer username you registered.
At the bottom-left corner, click on the + button to add a new network. Name the network network-bnc; replace network with the network you want to connect to. Then, click on Show details.
Select the General tab. For hostname, use your bouncer server (it should look like example.ircnow.org). The port should be 31337, and check SSL. Uncheck Use global user information and fill in the Nickname with the bouncer username you registered, and the user name with the bouncer username you registered.
Select the Connecting tab. Check Auto connect to this network at startup. Check Use SSL for all the servers on this network. For the Server password, put username/network:password. For example, if your username is john, the network you want to connect to is ircnow, and your password is abcde12345, then Server password should be john/ircnow:abcde12345.
Click on Connect in a new tab at the bottom of the left window.
If you see a message saying ZNC is not yet connected to the network, type /znc connect -- wait a few minutes to connect.