Editing styles with macros/VBA: a simple question

[c1905]

Greetings,

I'm using Office Professional Plus 2010 on Win 7 64 bit. I'm trying to create a style that (among other things) automatically wraps parentheses around text once the style is applied. I found no simple way to do it, but someone somewhere suggested using the following code:

Sub AddParens()
    Selection.InsertBefore "("
    Selection.InsertAfter ")"
End Sub

I understand that this is some sort of macro or VBA, but I cannot figure out how to modify my style (let's call it "paren") using that code. I've made many searches and all I could found was many examples of codes without any explanation of where exactly they are to be added. I have the developer ribbon visible and I played around with the "macros" and "visual basic" tabs, but could find nothing there to help me.

Your help is appreciated.