Adding jar file in netbean 4.0

I like to ask if any one knows how to add jar in a project in netbean 4.0 ide. I have tried almost everything but still unable to make it work. thanks.
[158 byte] By [cougariiva] at [2007-10-1 5:16:04]
# 1
Open the project's properties page (right click it) and add it to the compiling sources.
ChuckBinga at 2007-7-9 13:09:20 > top of Java-index,Administration Tools,Sun Connection...
# 2
It did but when I create reference to a class which is inside a jar file compiler gives error message that Class not found. Am I missing step number two, I order to excess methods of class which is inside that jar file. Thanks
cougariiva at 2007-7-9 13:09:20 > top of Java-index,Administration Tools,Sun Connection...
# 3
There are a bunch of possible reasons why you're having problems. The best solution is to learn about using jar files. The JDK documentation explains it all.
ChuckBinga at 2007-7-9 13:09:20 > top of Java-index,Administration Tools,Sun Connection...