Like this
SPSET 0,2
X=100:Y=100 X is for left and right, Y is for up and down.
@LOOP
IF BUTTON()==1 THEN Y=Y-2
IF BUTTON()==2 THEN Y=Y+2
IF BUTTON()==4 THEN X=X-2
IF BUTTON()==8 THEN X=X+2
SPOFS 0,X,Y this sets the X/Y/Z of the sprite
GOTO @LOOP
Hope this helps :)
Protip: You have no way of getting out of that first loop. You can fix this by setting an escape using another label and GOTO, or switching to regular structures such as a WHILE/WEND (recommended). Also, I'm pretty sure the name "Skrillex" is copyrighted, so you won't be able to use that.