Silly rabbit- belted automatics don' t shift!! (the new rincon 650 is a beltless auto that does have 3 gears like an automobile,it is the exception)
They have a CVT transmission. They' re is a belt that rides between two sets of sheeves, as yoo apply throttle the belt will ride up and down for different gear ratios.
The eiger is a nice 4 wheeler. Just put it in low for slow crawling or pulling. High gear for everything else. Give it gas when in high until you achieve the speed you desire. if you want to go faster, give it some more gas!!
Make sure you come to a complete stop when shifting between high/low /reverse.
If you ever sink your 4 wheeler you will have to pull your cvt' s belt cover to drain it out and then you can see what I' m talking about.
If you can' t wait until then. Go to your dealer and ask them to pull it up on their micro -fich. I' m surprised they didn' t explain all this when you picked it up.