OK, So you want to shoot a group instead of one shot. The process could still be the same.
0, Make sure all screws and bolts holding the gun together are tight
a, Make sure the scope mounts are tight and solid
1, Shoot three, five or even ten shots making sure each shot breaks evenly and clean (hopefully you have a group, if you do not*)
2, Make sure that the gun is held firmly, Lead sled or other good bench bags.
3, Look thru the scope and hold the crosshairs on the point of aim.
4, DO NOT MOVE THE GUN!
5, Adjust them scope knobs so that the crosshairs move to the center of the group.
6, Shoot to confirm zero.
* If you do not have a group, either you have a crappy rifle** or you are not a good shooter***.
** If you have a crappy rifle, I am sorry for your loss. Spend some money and get a decent one.
*** If you are not a good shooter, get a GOOD 22lr rifle and spend a lot of time practicing perfectly, take a class, find someone who will teach you. You must be teachable, this is your attitude.
Also this does not work as well with iron sights. But it could with very good eyesight.