what rifle is it on ? air rifle ,rimfire,centrefire ?
anyway make sure you have set the scope the right distance from your eye its important for you to get it right for your eye. when your happy make sure the mounts a done up right but not over tight.
then set up a target ie if its for air rifle then set it up at 20 yards to start with see where the 1st shot hits on the board
if you miss the board completely then bring the board closer.
then once your on the board adjust to suite ie''' say its 3 inch to the right of the bull and high adjust one at a time so come down on the scope