Change product field name that will show on confirmation email.

I want to use a field such as *products model *(a field that I don't use) to hold product information (link, user name, password) that I don't want to show up as a description, but I want included in the email confirmation. I am not using attributes, because that information is public.
I am selling courses, all come with online access and some with hard-copy materials. My customers are older, many with limited computer skills so I keep it simple.
I tried an IF statement in the email confirmation, order.php, but I couldn't get it working. The email confirmation information needs to be product specific. I thought I could include a products field in the email confirmation, and I am not using all of them.