Possible to edit admin user password as root?

I just got a new server and want to disable direct root login so I have to log in as admin and then use the - su command. Only problem is that I don't know what the admin password is. The user seems to exhist (can this be double checked somehow?).

Can root change the admin password?

What are the commands for adding new users to the server? I found the commands etc. for adding new users to the wheel group, but I can't find the commands for actually creating the new user.

Thanks.

 

 

 

 

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