Adding Checkboxes to Form

Is it possible to add fields containing checkboxes to the Contact Form when using the Contact Form Solution Pack? I would like the user to be able to select one or many courses from a list and have the choices submitted in the email along with the usual contact information.
Example:

Please select course button, complete the form, and submit below:
(box#1) Course #1
(box#2) Course #2
(box#3) Course #3

The standard contact form works fine without the boxes, but I cannot get the form working after I add the additional checkbox fields. I am not sure what changes I need to make to get the form working. Does additional php need to be added in the form fields or to other files? Do the boxes need to be validated in order for the form to work?

As long as I'm asking for the moon, is it also possible to have the form validate the fields to check whether at least one of the checkboxes has been selected? I would greatly appreciate any help and advice that you can spare to get this form going. Thank you.