All new equipment needs to be sighted-in. Don't expect a new rifle or a new scope to hit the target just because they are new! Sight-in your own gun; don't ask somebody else to do it for you.
Whether your rifle is brand new or 50 years old, it should be sighted-in each and every year. Don't assume that your rifle or bow will perform the same this year as last year. When you are sighting-in, shoot three or four shots without adjusting the sights! Once you know where your bullets are striking on the target, you can adjust the sights.
The rear sight on many firearms is adjustable. Move the rear sight in the direction you want to move the bullet holes on the target.
Look at the three shot group on the top target at the right. How should you adjust the sights?