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  1. Turn everything off and install fresh batteries
  2. Set up your remotes:
    1. Slide your remote Speedlite onto a FlexTT5 or FlexTT6 and lock it down
    2. Turn the Speedlite on, and set it to ETTL - don't use "Master" or "Slave"
    3. Turn the FlexTT5/6 on to C.1 - a low power flash confirms it's ready
  3. Slide your FlexTT6 onto your camera and turn it on to C.1
  4. Turn on the camera, set the shutter speed to 1/160th, and shoot a calibration shot to prime the radios - the remote Speedlite won't fire
  5. Start shooting TTL pictures!

You're all set!

This is Basic Wireless TTL. Adjust your camera's Flash Exposure Compensation to change the power level of your Speedlite. You can't adjust power levels using the camera's [Flash control] menu settings, but there are easier and more powerful options:

Next recommended reading: MiniTT1 and FlexTT5