Note: Before you do anything, install/buy Delta Touch first, apks not from the Play Store won't work by the way!
Welcome to the unofficial Delta Touch manual! This will show you how to set up and do more things to Delta Touch!
First, download your Doom wads (doom.wad, doom2.wad, etc) then put them in OpenTouch/Delta *You can also put your mods in OpenTouch/Delta/mods
Then, choose what source port you want to use
There, you have officially set up Delta Touch!
The only setting that might confuse you, is Immersive Mode
Immersive Mode: basically fullscreen mode.
The rest you should know. Hopefully