General information about the site

This site is pretty similar to the former EP site, but here are some features missing, which I maybe just didn't find yet... Therefore the questions:
Is it possible to look after people using a filter? (for example by giving age, gender or groups they have joined) - I've seen that you can look up all members of one group, but back on EP you could for example order these by age and gender. also it was possible to look up all people who chose to be member of two or more groups, which you could then search for (example: here you can look up all people who joined group "A" and afterwards all people who joined group "B". I'm looking for an option to find only people who joined both groups)
Also I was wondering how (in case these options really don't exist) I can contact a site admin or other important people to suggest these ideas. In the tab "account settings" I could find "submitted reports", but yet I don't know how I can submit a report o.O. Please help me out a bit here :)