In gE 1.5? You use SetScale, which is a function that changes the actor's size. Mind you this only works with the physics version of gE. If you want to use canvas, you can use draw_from, as follows.
canvas -> Draw Actor -> Script Editor
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erase(0,0,0,1);
draw_from("actor", width/2, height/2, 2);
What this does is draw actor at a scale of 2 in the middle of the canvas. You could move the canvas around to use this, or offset where the actor is drawn.