Setting up SSH for a user

I have a dedicated server running Red Hat and Plesk 7.5.2
I am trying to setup SSH access for one of the users on the server so that they only have access to their specified directory and not to any other parts of the OS

How can I do that?
My host told me to edit someting in the /etc/ folder. I think it was some password file but they were not clear and I couldnt find alot of info about it.

 

 

 

 

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