How do I change the 2014 ford fusion hybrid transmission fluid?

In short, You shouldn't. Your 2014 Ford Fusion Hybrid isn't supposed to have its transmission messed up by the owners. Of course, You're not going to heed this advice, but we're legally required to put that disclaimer. A little bit about Your transmission, as it is: it's a power split device, where the planetary gear, sun gear, MG1 and ICE come together to power the car. This isn't the same as Your typical geared tranny. Checking the fluid level is accomplished by loosing a bolt near the main driveshaft, and seeing if fluid drips out. If it does, it's likely at a good level. If not, You're low. To drain, so You can change the tranny fluid, You'll need a hose.