any one use communityarchitect.com to offer free hosting at own website!

hi everybody
i am using communityarchitect.com to offer free hosting to the users of my website. but when i subscribed for the service they asked me to change my existing name servers to there servers name. after i did my domain name was not pointing to my existing website any more, as i was using web forwarding to the space provided by my ISP. when i contacted community architect they said i should give them an IP address so that they can point the domain name to it. but i am not very familiar with all these things. and i do not have an IP address because i am using free webspace provided by my ISP.
so i started thinking to host my website somewhere else, but when i checked some hosting companies they asked me to change my DNS to there servers, if i do so i will not be able to offer free hosting at my website any more.
i hope my story is not very confusing.
do anyone know what i should do, so that i can use communityarchitect.com service and in the same time point my domain name to my website.
thanks for help.