How Do You raise the humidity levels in a Tank?

im a first time king keeper and hes goign thru a shed n would like to know how to raise humidity levels?

I just mist once a day, but I use rubbermaids as cages...they hold humidty much better than glass tanks.

what do u have for heating? if over head place ducktape on the screen top while leaving a space for u lamp... make sure u have like a couple inches around the lamp so u dont kill ur lil'bud. or if u have U.T.H place a large water bowl in that area of the heater.... i use both bc it harder to keep a temp in my chilly house.....