Rapidcart 3 : customizing mail

I have a clients site with a shop that has to be updated once a year. I build his shop in rapid cart 3.

I updated the site last week and tested it. But the mail with the order that goes to the buyer, still contains the text from last year. I can’t find the place where I can customize the mail that goes to the buyer in RC 3.

Anyone an idea where I found the option to customize ?