Hi Nicole ,
Profile is must component for any authorizations. Role is like a container and profile is actual core for authorizations.
you have to generate profile for that role using steps shown by Mithun.
you can also generate profile by using Tcode - SUPC as per below. ( this is quick and mostly used when you are generating profiles for multiple roles)
after generating profile, make sure to check user comparison Tab too - it should be green.
I hope this will help you.
Regards,
Satyajit