Both of these are questions I can answer so I'll be happy to do so!
1. Search for a given player, click the Collection Summary button, then at the very bottom click "Ranking among other members collecting this person."
2. For permissions head here to complete the steps required for each level, then to get to Level 8, earn enough points by resolving IRs, adding images and checklists, and anything else that counts. I forget what each ranking and its corresponding point total is, but you can learn more about points here.