Step 1: Tap "More" 
Step 2: Tap the "Safety Switch" icon at the top right
Step 3: Tap "Activate Safety Switch"
Step 4: Tap "Ok, proceed"
And you're done!
You may deactivate the safety switch at any time by tapping "Deactivate Safety Switch".
Step 1: Tap "More"
Step 2: Tap the "Safety Switch" icon at the top right
Step 3: Tap "Activate Safety Switch"
Step 4: Tap "Ok, proceed"
And you're done!
You may deactivate the safety switch at any time by tapping "Deactivate Safety Switch".