I've set up FormMail and it's working great. But, I realize I'd like my contact's last name to appear in the subject line, so that I can see at a glance who sent what.

I'm not a coder, but I can generally figure things out. This seems to me that it must be really simple, but I need some guidance this time.

(input type=hidden name="subject" value="Business Contact")

How would I add the last_name variable to that?

Any help appreciated!