I donated a car to American Diabetes Association; do I send an original or copy of this?

I can't remember the name of the form I send. However, do I send a copy or an original a form that has to go to IRS for proof of the donation?

No, don't send the IRS a copy. Just KEEP the copy and report it on you income tax (Schedule A). If you get audited, you will need to show it.