try this
http://en.wikibooks.org/wiki/Scratch/Lessons/Movement
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A sprite is like a character or thing on scratch
If you want to get a sprite to go up, set the direction angle to o degrees and then walk 10 or 20 steps and to go down set it to 180 degrees and walk some more steps.
Use the blue motion block Point in the Direction (click on the arrow next to the number to change) 0 = up 180 = Down then add the blue motion block: Move 200 Steps (change the number to whatever you need) See my Simple Shooter example (See links below)
200.00
it will explode