http://www.stencyl.com/help/view/mobile-input/Theres a bit of general information.
If you open up stencyl, go to any actor or scene doesn't matter, click "User Input" on the right hand side, then select "Mobile-Only" on the very far right. Inside there are the mobile blocks. If you right click and select "Help" it'll bring you to the stencyl help section with the description on what the block does etc..
Are you using the free version? If so you won't be able to publish and if I'm not mistaken the free version doesn't work with anything besides flash. My suggestion to you, like I was told is to learn stencyl a bit first. You can create the same exact game in your head, just using mouse functions to help you learn easier. But if you have the paid version disregard that.