how to show jpanel from external jar?

Here is my case:
1. i've made a desktop application using netbeans
2. it contains main.class that launch the myForm.class.
3. it works when run from its project and netbeans
4. then, i made it became a jar file
5. i put the jar file in a specific folder (eg. as same folder as the new desktop app. 'll load the jar). so, how i should load it when run time (using source code)

How did you make the jar

using clean and build menu on netbeans

here my class that will be loaded as external jar

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i am really sorry, i sent it in "advanced java" first and i recieved from DarrylBurke said: "Moved from 'Advanced Java'.
so i thought i need to rewrite my question in "new to java" forum. i am sorry, but until now i can't solve my problem. am i in wrong forum again?