This is my first time incubating, so please forgive dumb questions. I set the eggs on Sunday 2/13, so by my count 3/4 is lockdown. But what is that? I don't open the bator now except to check the water levels... and the water lasts days so I don't know how I can increase humidity? It is a styrofoam LG with an auto egg-turner... 2 thermometers but nothing to measure humidity. The directions said to leave one of the red plugs out... do I put it back for "lock down?" help?