Goal: Go to the Data saving option in YouTube settings and  enable data saving mode option 
Steps:
action: action_type: navigate_back
step_instruction: go back to previous page
action: action_type: click
step_instruction: click on the profile picture at the top right corner of the screen
action: action_type: click
step_instruction: go to settings option 
action: action_type: click
step_instruction: click on the data saving option
action: action_type: click
step_instruction: click on the data saving mode to enable