I recommend using the number input boxes to move them. Click a frame. Set the onion frame. Select the number input box & just use the arrow keys on keyboard to adjust/nudge the values - works much more precise than via the mouse.
Quick note: Alex recently adjusted how the movement works. Now works with absolute pixels instead of whatever the movement value nonsense was before, which means you can now duplicate the animation & adjust the delay between animation frames to speed up or slow down the walk or even use Lua in-game to adjust walk speed of the animation - which is probably a better idea as you don't need to have the walk animation reset that way.
