This is all depending on the mIRC version you're using.
Go to file and to options.
Go to the connect section under Category
At the top it should say IRC Servers: and a down box that should say "ALL"
if it doesn't, select "all"
Next click on "Add"
for the Description type in "Mortal Kombat"
for the IRC Server type in "irc.webmaster.com"
for Port type in "6667"
Click "ok"
Under the "IRC Servers" tab there should be another drop down box under it.
Look through them and at the bottom should be "Mortal Kombat"
Click on it then click "Connect to IRC Server"
When it connects, type in the chat window, "/join #MortalKombat"
You should be sent to the Mortal Kombat online room, it has about 124 people in there.

Thanks bro it's working now

Since some people actually know what they are doing. I downloaded The Java thing and at the website it says to enter my Username, Nickname, E-mail address, and Join Channel. Could someone tell me what to fill in in these? I know my email address, but does it have to be a certain Username or nickname. And do I just leave the Channel the same? Please help.

If you're connecting through Java then I assume you're using MKO's website to join. Pick whatever Nickname and username you want.

That's what I figured, and just leave the Join Channel the same. But then I hit Connect and it doesn't do anything. Does it take awhile for it to load? Or is it too full. Or it might just be my computer.

Hmm, It might be your computer... I just went to the Java site on here and I connected to the chat just fine.

Well, since I am most likely not going to be able to get on. Can someone type the questions and the answers Boon and Co. gave in here. Or make a thread about it?