Welcome. You can mist ooths if you want. They get wet when it rains in the wild. It won't matter either way. In the pic you have the exit for the nymphs facing up. You should flip it over or turn the part you have facing the ceiling towards the floor about halfway. It will help them emerge. If you want to release any keep in mind that your ooth will hatch far earlier than any ooths in the wild.