I called my bank to find out where this was on my CC, and they had no idea.
I called Authorize.Net and they had no clue what that field would be.
I am a novice at WordPress and PHP, though I am learning quickly

I would like to know how I remove this field, or at minimum tell people what the heck it is, so they know what to enter

I have people waiting to subscribe, and the only thing holding me back is getting the registration and payment form ready

Thank you for any and all help. You can see this test page by going to http://pattybenton.com/test/.
Patty