download it, install it, open it ^^
connection -> quick connect
paste server adress, chose a nickname (of course ^^), login name not necessary, pw-> connect
on the left side u see the channel list. if u dont see our channel go to channels -> create a channel (codec: speedx 25.9kbit) and use the givn information for name and pw.
maybe u have to change some settings, but this can be figured out if we talking