How do I Set sprite off center?

I'm working on a fully working tank, but i am stuck with making it's turret move, because every time this happens:

the turret axis in near cannon, in short it isn't where is should be thanks for help if there will be any

Check image points on the turret.

Origin image point is the "center" of the sprite. You can move it to where you want it to be. Also, you can define other points, for example "FirePoint" on the tip of the cannon, where bullets will be fired from.