Naive keyboard data entry works using a normal keyboard for the 26+10 alphanumeric keys, the 11 usual punctuation keys, as well as space, tab, backspace and enter.
Position the mouse cursor on either the graphics display III console which is showing the famous "TAKE ME I'AM YOURS!" prompt, or the console teletype, which is showing "Stanford 6.17/J 07-25-74" blah blah then "DDT STARTS AT 156717". Hit a few ENTERS and see the system dot prompt.
Next type some simple commands: HELP or HELLO or DAY or TIME. To login use my code, "L 1.BGB<enter>". Then Go back and view the automatic demonstrations for more hints.