Goal: Join the "December 100k Challenge" for me on the Runkeeper app.
Steps:
action: action_type: click
step_instruction: Click on the tab "Explore" at the bottom right corner of the screen.
action: action_type: click
step_instruction: Click on the tab "Challenges".
action: action_type: click
step_instruction: Open the tab "December 100k Challenge".
action: action_type: click
step_instruction: Click on the tab "Join now" at the bottom.