Scheduling DODMERB EXAM

I'm currently applying for the NROTC Scholarship and the USCGA. How do I schedule my DODMERB exam?

Also, does anyone know if I have to be accepted to the NROTC affiliated school if I didn't apply to the NROTC host unit school?
Ex: Host school - Carnegie Mellon University (did not apply)
Affiliated school - University of Pittsburgh (accepted)