How do I turn dark mode on? Stan 08 September 2021 16:24 Updated Follow When opening the Crypto Challenge app, under the player’s username, select “View Profile”, where you can turn on/off Dark mode, and edit your personal details. Related articles How many Series are there? And how long does each last? What is the Crypto Challenge app? Who is eligible? How do I earn Rewards? Can I cancel a forecast? Comments 0 comments Please sign in to leave a comment.