I am able to select 'Allow Access from Local Networks' under Secure Shell Settings but I don't seem to be able to save it. Could you clarify how to save it & logout in the normal manner?
Secure shell has nothing to do with the server-manager. The server-manager is a set of webpages served by the webserver.
After you have logged in you should see a menu on the left hand side through which you can scroll with the up and down arrows. To select the highlighted option press the right arrow or enter. To switch to the other frame press Tab.
After pressing tab once you should be in the lower right hand frame, here you can operate with the arrow keys as well.
Navigate to the text box called "Network" and type the IP address of the network you would allow access, the subnet in the field below allows you to select which hosts on that network are allowed to access the server-manager, to allow a C-class subnet you would enter 255.255.255.0, for a specific host you would enter it's IP number with a network mask of 255.255.255.255.
After that navigate to the save button at the bottom of the page and press enter. The page should return in a matter of seconds and display a message on the top of the page showing SUCCESS or ERROR with a explanation.
Press q to quit.