No worries though, it is very easy to fix! All you need to do is set the lens and to the right orientation. I will show you how to do this in a few easy steps.
There is a small Allen wrench attached to the lens pouch that came with your lens. You should be able to find it on the string of the pouch. If you can't find it off the bat, it might be hiding inside of the drawstring hole of the pouch or sometimes it can fall off and might be in the box.
Use the small hex tool to loosen up the little screw that is on the backplate of the lens.
Here is the little screw which you need to loosen up by turning the Allen wrench a couple of turns counterclockwise.
Tip: Do not unscrew it all the way because it is very small and very easy to lose. If you do manage to lose it, however, we have thought of this, and already provided you a spare one. It is in the box taped to a white card with instructions on how to use it.