how to set the root password on deployed overcloud nodes

we have computes deployed that don't have a root password. We would like to set root password on a compute using the console.

I found this https://access.redhat.com/documentation/en-us/red_hat_enterprise_linux/7/html/system_administrators_guide/sec-terminal_menu_editing_during_boot#sec-Changing_and_Resetting_the_Root_Password

But the link isn't working and we are using RHEL8.

Thanks.
John