You have to go way at the top of your Map to the Ice Mountain thing(not the waterbottle :P)
Click the TEST podium-thing. And answer all the questions with like “yes, i’ll try my best” “only interesting stuff” bla bla bla.
After you pass the test with an “A+”. You can now enter the Comet, and Co. Reporters only place.
Then you can click either only the Camera Icon(nonmembers) or the Camera Icon and Item if you’re a premium member.
After that you can look at the day’s assigned Topics to take pictures of. Just click the camera (top-left next to Guide) to take a picture then write a description.