But perhaps you need something which gives examples. The word for that is "tutorial". I would suggest the place to look for such things is on the JProfiler site, but if you can't do that then your google keywords would be "jprofiler tutorial".
The problem for me now is how do I know what to do to find a memory leak, for example? There is some learning/training involved. What about YourKit? Both are commercial. I can't find a good open-source equivalent with decent documentation.