How to Change the GRUB Passwd on RHEL 7

Needing to update the GRUB password for RHEL 7 VM.

It appears that in RHEL 7, we are unable to edit /boot/grub/grub.cfg and need to use something called grub2-mkconfig .

http://www.unixarena.com/2015/04/how-to-edit-the-grub-on-rhel-7.html

However I'm not sure where to go once running the grub2-mkconfig command. According to my research, it different for both RHEL5 and RHEL6.

thanks