Help setting days on incubator

[Ctwormsandgardens]

I set up my newly purchased egg incubator.
I've read the entire book, viewed the FAQs and watched all the videos I could find on this model and none of them show how to change the "hatching days" setting. By default it reads zero at set-up, however, any others I've seen start at day 21 and count down, not start at zero and count up.
Here is the product link, any ideas?
https://a.co/d/841dzbW

 

[Debbie292d]

There has to be something in the instructions on this because only chicks and a few other poultry are 21 days. Turkeys, geese, ducks, etc. are different.

I looked at your link and found a review that said this:

"The number of days of incubation, temperature, humidity, lighting, and even the brackets for placing eggs can be adjusted and placed according to the required size just like the storage racks in my warehouse."