HELP primitive name
HELP exits Logo and brings the Logo Help system on the screen. The Logo Help system contains definitions and examples of all Logo primitives and system names. If HELP is used with no arguments, it takes you to the beginning of the Logo Help system. If HELP is used with a primitive name as an argument, it takes you to the definition and example of that primitive.
You can also invoke help for a specific keyword by moveing the cursor of the word and pressing the F1 function key.