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This is easy and simply done and that is to follow the instructions on humidity.
Most manual control machines without a humidity display will have two water troughs. It’s best to add water to one trough from day 1 till 3 days before your eggs are due to hatch. Doing this will - and should - give you the correct humidity as long as the incubator is in the correct environment. A room who's temperature is in the range of 18°C-22°C will give you the required humidity level.
You do not need to add water every day, and the trough does not have to be full. You just need to ensure water is covering the surface of that trough.
For the final 3 days, add water to both troughs, ensuring there is water covering the surface of both. Humidity levels depend on the surface area of water. The larger the surface area, the higher the humidity. This is why you fill both troughs on the final 3 days. The depth of the water doesn’t matter; it’s the surface area it covers.
If you are unsure and don’t think that you're achieving the correct level of humidity, you may want to check the room temperature and also look into egg weight loss. Weighing your eggs throughout the incubation period to measure how much moisture you are losing is the best way to monitor your humidity.
For example: if you want to be losing 10% moisture but are losing 13%, then the incubator is too dry. If, on the other hand, you are not losing enough, - again wanting to lose 10% but are losing 7% - then it is too moist in the machine.
You can also look into buying a hygrometer (a device which measures moisture levels) to place inside your incubator, but we would still advise measuring the egg weight loss. Humidity displays are relatively new and for years, we used to measure the egg weight loss and add water to the water troughs. This worked and still does to this day and a lot of breeders still practice these methods as they are successful (and reliable) ways to measure the humidity.