LOGIN PAGE NOT WORKING

This page http://reachgroup.org/co-op-registration-west-cola/
requires that you LOGIN to complete the registration form.
However, when members try to LOGIN to this page, they cannot login. If they go to http://reachgroup.org/wp-admin and login then they can go to this page - http://reachgroup.org/co-op-registration-west-cola/
But I need for the login on this page http://reachgroup.org/co-op-registration-west-cola/
to work.
Thanks,
Robin