When I use the matching function, I only get results from Foreign countries.  However when I search specific cards using the view off or view request tabs I find lots of US based users that I can trade with.  Do I have some type of setting I need to fix to match with U.S . users. Thanks for help.

Hello,
 
A correction has been applied : Matching should now display the english speaking users.
 
Please let me know if issue is also solved on your side.
 
I am sorry for the inconvenience.
 
Best regards,

Thank you

how do I know where to send my cards once ive excepted an offer?

The person you traded with will provide their address.