groupadd on bash

I am installing mysql binaries on my mac. The first instruction says
to add a mysql group at the shell. It is the bash shell. There does
not appear to be a addgroup command. I found a setgroups command but
it didn't work.

j-rs-computer:/Users/jr root# sudo su
j-rs-computer:/Users/jr root# setgroups mysql
su: setgroups: command not found
j-rs-computer:/Users/jr root# groupadd mysql
su: groupadd: command not found
j-rs-computer:/Users/jr root#

I also tried:
j-rs-computer:/applications root# /bin/bash
j-rs-computer:/applications root# groupadd mysql
bash: groupadd: command not found

Can you tell me how to add a group?

By the way, after you do sudo su to be the root user how do you switch
back to the regular user?
thanks,
.

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