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The real PChicken got b@nned for calling out Randy SB (now named PChicken). Randy SB apparently was the one that falsely reported him.
Just letting everyone know.
USE [slot number]
SmileBASIC can't use things in a slot until you USE (function) the slot. If you write a new function with the PRG commands, you must USE (function) it before you can use it.
Try these in the terminal:
PRINT "Hello world!"
INPUT "What's your name",NAME$
PRINT "Hello, "+NAME$
Also, I recommend reading the manual, it gives a nice intro to SmileBASIC.