How can I edit the denial email to the user, so that I can explain them

How can I edit the denial email to the user, so that I can explain them what they did wrong? There can be many different reasons and I need a field where I can write one or two sentences with an explanation, is it possible? Now can only send en uneditable email.

Hi Marie,

Please check the short video below to see how you can edit/customize the denial email.

If you are referring to a different option then please let us know.

Thanks