First off, is it the manual or the automatic (CVT)?
For the Manual, check the owners manual for the proper type of fluid (i think it's Chrysler ATF+4 but don't quote me on that).
If it's the CVT, the fluid does not need to be changed until 120k miles so you don't need to do anything (unless you've used the vehicle for fleet, taxi/police or lots of towing, in which case change it at 60k miles).
That being said, you can absolutely change the CVT fluid outside of the dealer, but you'll need a dealer tool to check that you have added the correct amount of fluid back in (and you can purchase the tool). You will also need to purchase the CVT+4 fluid either from the dealer, or off the internet and it's not cheap either way. You can purchase the trans filter and gasket also from the dealer.
When checking the fluid level, you need to know the fluid temperature and get a copy of the temp-to-level graph. The dealer dipstick tool has centimeter graduations on it so at a certain temp, you should read so many CM of fluid.