Can't " su - "
Hello,I got a problem with command " su- "
I have logged in as User then I " su - " to root, but I got permission denied. Because I have some wrong chown before

Do you know what file is content command " su - " ? And where is it located ?
Now, I can't log in as root yet, because I have been disabled root log in and disable Telnet too . Do you now how can I chown the files content command " su - " again ?
I'm using RedHat9 and CPanel/WHM.
Thank you for your help !