Usage
Just open the preferences dialog in NetBeans after the installation and go to Options -> Editor -> External Formatter, select the programming language you want to change the formatter for and setup the formatter as you like.
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You can also setup the formatters per programming language individually per project, just right click on the project and click on Properties, navigate to Project properties -> Formatting -> External Formatting. Make it a tick in Override global settings.
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If you want to automatically format on saving your files, go to Options -> Editor -> On Save and either select All Languages or the programming language you want to enable the formatting when saving a file and choose either All Lines or Modified Lines Only.
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If you select a specfic programming language in the Languages dropdown, make sure to untick the Use All Languages Settings for that programming language.