Just add this to the script.
For moving right:
<if><key[ right arrow ]pressed?>
<set{ ScrollX }to( How fast you want to move
<end>
For moving left:
<if><key[ left arrow pressed ]pressed?>
<set{ ScrollX }to( Same speed as before, but a negative number.
<end>
Make sure you're moving the same speed as scrollX, so there should be a block like this somewhere in your script.
<move( <{ ScrollX }> )steps>
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