You can PM any of us individually. If you pick the wrong one and we are slacking it could be a few hours before we respond.
If you click the little (!) red triangle on the left of any post (or there is a report post option in the app) then it goes to ALL of the moderators and whichever of us gets to it first will deal with it. This is the best route for reporting posts as we get a link direct to anything troublesome.
Or, if you are locked out and have a technical issue (which is not something that ordinary mods can fix) then the Contact Us link at the bottom of the page will bring up a link which goes to the technical team to get sorted.