CVV2 Text replacement with Security Code

[Itzys]

I recently added the CVV2 to my orders. But my clients are not entering the information. They don't know what CVV2 is. On some commercial websites I noticed that there is a link, next to the security code entry box, to a popup window with information about what the "Security code" or "CVV2" is.

How do I Change the Text to read "enter the 3 or 4 digit security code on the back of credit card? Or is there a contribution to this issue?

 

Thanks

Itzy