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Down in the bottom you have three chambers, two that look like | and one that looks like a squared off O. During incubation, the O normally is about all you need to get the humidity in line. To bump it up during hatch, fill it and the two straight liners.
Notice I said normally back there? It will depend upon your ambient room humidity too. Right now with an LG I have two choices: dry incubation or no incubation. Since the air is so dry (drought conditions here), I have to fill the big one and a smaller one to get up to about 35%. During hatch, I fill the final chamber and add a sponge in a bottle.
Splurge when you can and get a fan in there. Definitely helps on keeping the temp leveled out.