Trigger a pop up or disclosure when Certain Template is selected

Trigger a pop up or disclosure when Certain Template is selected

We have a template that is going to be a request to Add a new user, this will be for a very select group of users. I need to have a pop up window or notification pop up when a user clicks to use this template display an important disclaimer message. Is there anyway of doing this that is not too complicated or time consuming?

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