Ok, here is an example of what you could do: go into EDIT mode and on the first line type, CLS, Then on the third (or second, not really sure if it matters) line type, PRINT "HELLO WORLD", Then go into direct mode and type "RUN" and press enter.
Keep in mind that this is a very simple example of what you could make in SmileBASIC. But it's always best to start out small.
all this game is is just creating video games and playing them and you can use a public key to down load other peoples games they make and other people can download your games and play them to