How do I respond to this email?



They are on to you Mr Steadman! lulz
this was in the comments of that link:
"
I feel like a complete idiot. I hate to admit this, but I fell into the trap of this ad. I never fall for those things as I consider myself fairly web savvy. I followed the link and saw that Mike was from Chesterfield, and was doing fairly well. I read more, then followed through and yes, I put my credit card information in there. Didn't find out this was fake until I googled Mike Steaman and notice he was from NY and DC.
Question... What do I do now? What will these guys do with my credit card information? How do I stop any future charges. Was anyone else dumb like me and sign up? Did anything happen?
Thanks for your help!"