As A new Adofai player it is hard to find a tutorial for Adofai to download custom levels since most of them are for maps that are not in the workshop check those out if you need that but this is for beginners like me that wanted custom levels.
The first step is the open up the workshop you can do this by opening up community in Adofai and going to workshop or in the game pause and it will have an option to bring you there next you can see a search bar search up the level you want for example rush e click the one you want once you hit enter and you will see the picture of the level all you need to do is scroll down until you see subscribe once you hit subscribe open up adofai you can have the game open too once you have done that go to the custom levels in the game hit workshop and you levels will be there including the one you downloaded. If the level is not there for any reason hit the escape button or whatever you settings button is and you will see refresh levels hit that and your level should be there. boom you have downloaded a custom level even though this is alot of words to follow once you remember the steps which took me me 2 minutes its super easy If there is any problems with the method please respond with the discussion and i can help hope this helped.