You do not need to transfer DNS server information to our server (we do not offer this service). You must leave it with the same provider.
What you need to do is to change your domain DNS settings in your domain host so that your web address www.yourdomain.org (and, if desired, yourdomain.org - without www) points to Wild Apricot's server.
See for details: http://help.wildapricot.com/display/DOC/Custom+domain+setup
Denys Zlobin
Helpful Apricot
http://www.wildapricot.com