You can undo progress for a completed lesson or course by following the steps below.
On the website:
Click the Completed! button from any Course on the My Path Screen to undo Course completion. 
You can also click Completed! from any Course screen to undo Course completion.
Click the green check mark from any course screen to undo Lesson completion.
On the app:
Tap the Completed! button from any Course on the My Path Screen to undo Course completion.
You can also tap Completed! from any Course screen to undo Course completion.
Tap the green check mark from any course screen to undo Lesson completion.
