Topic: Petite computer - A little help needed

Hi, guess if I was excited when I found petite computer. I have made a few game for Atari 2600 with the use of Batari Basic so I atleast have an idea of structure (I hope, hehe) and now I figured I'd move on to this. It wasn't that big of a transition except for some new words to learn. But I'm having a little trouble with the buttons. I can't seem to get them right. Here is my code so far on a project where I'm trying to make a text symbol move to the right when pressing right on the d-pad, but it does nothing. What have I done wrong? I get an error saying "Out of range (8, BUTTON). P.S I just want the player to take 1 step and not move continuesly.

CLS

@LVL1

PX=10 : PY=16
LOCATE PX,PY : PRINT "@";

IF BUTTON(5) THEN GOSUB @RIGHT
GOTO @LVL1

@RIGHT
PX=PX+1
RETURN

button numbers
Up 1
Down 2
Left 4
Right 8
A 16
B 32
X 64
Y 128
Also, search the petit computer forum and ask there

Thank you, got it working now and will look for it,