Congrats on completing your challenge. You need to click on your challenge in my challenges. Then click on submit. Link your Strava by clicking on the Strava link and entering your details. Then you can select the relevent activities from the list and submit them. If they are not all listed then you will need to submit them manually and adding screen shots. Hope that helps!

I just take photos of mine and put them on the submit bit on the challenge 🙂