Can't SU to Root on Telent

[Adam]

I set up my first server and enabled telent.  It's all on a closed network so I'm not worried about security.  I just want to practice stuff.

When I try to login in a root with the correct password, I get "Login Incorrect".  I expect this is happening because 'root' isn't allowed remote access.

So when I login as a normal user, I try to "su" and I get "su: Sorry".  Do I have to set some special permissions for this?

Thanks