Contact Form 7 – Edit existing form

Hello. I have a large form, created with CF7. I need to do some custom css work to it but there are other CF7 forms on the site that I don’t want to mess with. I figured the solution is to add ID/Class to each element of the form I want to work with, but I can’t figure out how to edit the tags, so as to give them Class names.

Please advise.