2000 Civic Rear Door frame lock?
 

So, I was trying to figure out why my back door only opened sometimes and then only from the inside, On the door itself where it would meet the door jam, was a switch that said frame lock or something like that, I flipped it down, thinking it was a child lock switch or something and now the door will not open at all from in or out, any ideas on how to undo that switch?

TIA