The springs are adjustable, however, the tool kit does not contain the tool to loosen the lock nut and tighten and relock the spring adjusters.
Many people use a drift to loosen the lock nut but a spanner wrench works much better for tightening or loosening the spring tension! Contact you dealer to find out the correct size spanner wrench.
Unless you are carrying a large load I would recommend not adjusting your shocks until you have over 100 miles on them. It takes over 100 miles to break in the shocks. Many people have not made significant changes to their shocks yet because although the front seems a little soft mine has seemed to stiffen up as I've put some miles on. The rear end is much stiffer and has a sway bar which is absent on the front.
We rode 87 miles yesterday in woody and hilly terrain at approximately 37-42 MPH average on mostly loose sandy soil or hard pack dirt getting about 15 MPG. 400 pound total added weight including cooler, people, fuel, tow strap, etc. and with 385 miles we are still using the factory shock settings. In these tight trails I can stay with friends with a 2015 RZR FOX Edition. They have more and tighter suspension but the wolverine ride is so sweet that we just wear them down and in time I can actually pull away from them. However on open faster trails where they are stretching their legs and doing jumps we are just a bit light on HP and they easily leave us in their dust with their 110 HP.