I can't figure out how (using the button) to add a template to an existing note.

[Metanoia41]

Hi!

1. Here's my question: How do I make a button that, when clicked, adds an existing template to my note?

2. I see in the settings a choice such as: "Create note", "Open", or "templaterCreateNote". But all this opens a note, or creates a new note,
   and I need to add an existing template to my note, not create a new one.

P.s. I tried to do this using a regular template. Without using Templater.

Is it possible to do this? If so, how?

I will be very glad to hear your reply!