Sub-accounts are a feature (from an addon package) which in theory let you post under multiple IDs without having to log out from one account and go to another. There should be a little thing near the upper-right that shows your user name, click on that to see a menu, one of the things on the menu is "sub-accounts". You should be able to create them. I can see sub-accounts, you can see your own, but you shouldn't be able to see other people's. THIS IS NOT FULLY TESTED. Please don't do anything where you feel you'd be endangered if you got identified because there could totally be ways to identify people that I haven't found yet. If you find one, please PM me.