How to form a team and become the leader?

I really struggled with this quest too. I was able to figure it out finally with help from all of the comments in the other answer, but it wasn't very clear so I'm reposting what I did as an answer to hopefully clear it up for people.

First, form a team. Second, tap the quest, and it will jump your team to that spot you've seen nearly a hundred times if you're like me. DON'T MOVE ANYWHERE!!! If you did, just tap the quest again to get back to that spot. Third, tap the camera, and take a picture. When I did that the quest completed, and I got the reward.