how do i put substitutes from my remote control of my iphone to the apple tv of the TV

Hi , first go to your iPhone settings/accessibility /apple tv remote and Rut off then from control center go to the remote and depend if what streaming services you are using just slide up/Down gently until you see the menu then navigate to the subtitles, once subtitles are select you will see it on the bottom of the remote see second picture… buena suerte