Hello Emily! 
Pipefy’s Email Template function works with html coding.
Having your desired link and a link to the image you want to use as a button you can code it this way into your mail body:

<a href="https://(your link here)"><img src="http://(your image link here)" title="(button text when hovering)"></a>

The result would be a clickable image to your link in the receiver’s email.

Hi @ricardo-borges need your help with creating 2 buttons to the email (Approve and Reject).

What link do I need to insert as I need to mirror the Radio Select options.  Please can you also provide screen shot examples thanks