I don't understand what's wrong. I did what the website said, but nothing happened.

You have to touch the Edit button, enter the lines there, and press Start.

WHILE ← You can't use WHILE without WEND ! WEND ← WEND is need after WHILE !

Writing codes is like building a car. You do it in the factory, or the EDIT mode. The DIRECT mode you're in now is the showroom where you RUN the car show. You don't want to build cars right in front of the customers. Go back to the factory to do so.

you put an o instead of a zero at if I then spofs o,x,y right here ^