You cannot submit your before progress pics until you have scheduled in the plan properly. Once the plan has launched properly, schedule it into your calendar, and then go to your Dashboard. At the top of the Dashboard you’ll see your workout plan configuration panel - tap on ‘Plan Overview’ and if you’ve scheduled in a challenge plan, you’ll see a section to upload your before progress pics.
Schedule in your plan > Dashboard > Workout Plan Panel > tap ‘Plan Overview’ > scroll down to submit before progress pics.
If you are in the first week of your challenge and you haven’t yet uploaded a progress pic, you will also see an agenda item appear in the calendar on the ‘Today’ tab reminding you to do so.