tkirc is a frontend for unix's ircII (shell-client for the Internet Relay Chat) based on Tcl/Tk. If you know how to use ircII, you should not have any problems to use tkirc after installation. See /usr/pkg/share/doc/tkirc/README for more information. Also, copy /usr/pkg/share/doc/tkirc/tkircrc-example to $HOME/.tkircrc.