Welcome to LQ.
RHEL offers paid support. Presuming you're not paying, you're better using something with wider support.
That aside, try opening
http://localhost:631
If the cups server is running, that should open a configuration page. Otherwise, it's wrong/missing fonts. RHEL isn't fussy about stuff. It's 'EL' = Enterprise
Linux, so it's for servers, not for you, most likely.