membership registration issues

I installed the membership plugin on lrmpress.com/pcs5
i want it to restrict access to the download-able materials in that section as they relate specifically to 1 ipad app.

the login redirects me to the parent site- ie, lrmpress.com - and lets me register/login there not to lrmpress.com/pcs5. am i to assume that what i am trying to accomplish is impossible?