The tilde.chat irc network is available at irc.tilde.chat:6697 (with ssl).
The technet.chat irc network is available at irc.technet.chat:6697 (with ssl).
znc, znc's wiki, it's just logging in with your shell username and with your shell password.
The znc system checks your password and automatically makes a user for you on the first login.
The webui is at https://znc.tilde.green/.
And client connections are made to znc.tilde.green:6697 with ssl.
The znc wiki is a great resource of help.