In both examples, replace "YourChannel" with the name of your channel, without the initial #.
You can simply link to a URL like this:
Or, you can use the following code:
<iframe border=0 frameborder=0 scrolling="no" width=750 height=500 src="http://java.surrealchat.net/javaiframe2.cgi?w=750&h=500&chan=YourChannel">
You may change the size of the applet by changing the appropriate numbers (750 by 500 in this example). Be sure to keep the size on the first line identical to the size on the second line.
Other options you can customize are listed at Help/Java iframe options.