What version of DW are you using? (Note that this is not a DW forum.)
What tutorials did you look at?
Note that you don't need DW in order to build PhoneGap apps. Any text editor will do, if there's one with which you are more comfortable. (You'll want to become familiar with the PhoneGap CLI, too. Or PhoneGap Build. Either way.)
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The PhoneGap support was removed after Dreamweaver CS6. So the tutorials you were referencing of date (like one of mine on Lynda.com).
You can still use DW to author your app, but you have to manually upload to PhoneGap Build.