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Uninstalling it is all you need to do.
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You can get a price on adding additional licences here: https://www.gpsoft.com.au/DScripts/licencemanager.asp
Note that the licence terms may not apply to another person using it in another location. They would probably need their own separate licence, depending on the exact situation.
For sales/licencing questions that aren't covered in Common purchasing, upgrading and licensing questions the best thing to do is drop an email to sales@ with details and they can give a personalised and definitive response. The forum is more for the tech support side of things.