You need to check the transmission fluid while it is warm and the engine is running.
If you look down below the air box on the front drivers side of the engine you will see the transmission fluid cap. The dip stick is connected to this cap. Here are the instructions from the owners manual for my 2016 but yours should either be the same or quite similar.
Note: Check the fluid level with the engine
running and the transmission in park (P).
1. Make sure that your vehicle is on level
ground.
2. Rotate the automatic transmission
fluid cap in a counterclockwise
direction. See Under Hood Overview
(page 279).
3. Remove the cap and dipstick and wipe
it with a clean, lint-free cloth. Replace
the cap and dipstick and remove it
again to check the fluid level.
4. Make sure that the fluid level is
between the MIN and the MAX marks.
If the fluid level is at the MIN mark, add
fluid immediately. See Adding
Transmission Fluid.
5. Replace the automatic transmission
fluid cap and dipstick. Turn it clockwise
until you feel a strong resistance.