To use (this) Jabber server(s) you need to have a local client installed. Luckily there are many clients for many platforms available. There is no right or wrong client, its all matter of your own personal taste and your required feature set. There are GUI clients for windows, Linux and mac, Clients that can do video and audio, and text only clients for the Linux console. Again, it’s all up to you.
Some client suggestions:
- Spark: http://www.igniterealtime.org/downloads/index.jsp#spark (Win, Linux, Mac)
- Psi: http://psi-im.org/ (Win, Linux, Mac)
- Gwibber, Gaim, empathy (Linux clients, consult your distribution)
And remember: You can be logged in simultaneously from many clients at once using but one account!