How to use WASD instead of arrows?

Mr-Destroyer

Hope this game gets good one day.
W and S and used to change axel so it can be replaced with (←, →) arrows.
A and Z are used to change the gear so it can be replaced with (↑, ↓) arrows.
D does nothing so replacing it doesn't make problems.
Can someone help me to change them to what I said ?
 
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