Connnecting UI controls to character

Ive been on this problem for some time now and i just don't understand enough about the way the UI works for me to fix it. So The controls of the character are an altered of those from the "Tanks" Unity template. So the character moves forward in whichever way hes facing. and its simple when the controlas are , A and D for rotate, W and S for forward and backward. But i just cant translate that to the UI controls, While also keeping the attack button.
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Connnecting UI controls to character