Locate the transmission fluid dipstick. It is a long, thin tube with a yellow handle located on the driver's side of the engine bay.
Lift the hood of your vehicle and remove the transmission dipstick.
Wipe the fluid off the dipstick and reinsert it fully.
Withdraw again the dipstick and hold it horizontally.
Check the fluid level on the dipstick. It should be between the "MIN" and "MAX" marks on the dipstick.
If the fluid level is low, add enough ATF to bring it up to the "MAX" mark.
Reinstall the transmission fluid dipstick.