Yes, you should add the path of your jdk's bin folder to the PATH variable. Search for PATH variable on our forum and I'm sure you'll find a thread that explains how to do it.
Please TellTheDetails when you have a problem. Don't just say "it didn't work" or "I couldn't use it". Explain in detail what you did, what happened, what error messages you got, and what you don't understand - then we can help you much quicker.