Use Keltner Channels, available with your platform, to set up the ATR channels on your chart.
TOS users may also use the following shared chart link:
Instructions for using shared links can be found here:
https://intercom.help/simpler-trading/en/articles/3290836
See below video on how to manually set-up John's 3 ATR setup.
STEP 1
Open the Edit Studies and Strategies window.
Find Keltner Channels in the indicator list of your platform.

STEP 2
Add three instances of Keltner Channels to your chart.

STEP 3
Change the settings for each instance of the Keltner Channels.

Set the first instance to a factor of 1.0

The second instance to a factor of 2.0

And the third instance to a factor of 3.0

The 1, 2 and 3 ATR channels should now be setup on your chart.

NOTE:
John often will use exponential instead of simple averages in the settings for average type and true range average type.

John Carter - Indicators used
https://intercom.help/simpler-trading/en/articles/3264101
John Carter - Small Account Mastery (SAM)
https://intercom.help/simpler-trading/en/articles/5256742
John Carter - Mastering the Trade
https://intercom.help/simpler-trading/en/articles/5257460
John Carter - Where can I see John's trades?
https://intercom.help/simpler-trading/en/articles/3291928
John Carter - Trading Journal
https://intercom.help/simpler-trading/en/articles/5246943
About - ATR Move
https://intercom.help/simpler-trading/en/articles/3578243