Workflows - email approval / rejection

Hi all!

I’ve configured a workflow for PO Approval process, pretty much as per the video tutorial (except we don’t have a material manager).

This workflow is working as desired.

I’m interested in the Approve / Reject options which get sent in an email:

How is this Approve / Reject email configured please? I want to add more information to the body of the email, but I can’t find where to do it.

Also, when is this email sent please? I’ve only received the emails on one day - it appears I’ve amended a trigger somewhere, but I’m not sure where.

Here’s the workflow:

Any help greatly appreciated, thanks in advance!