Step 1: Download and Open the App
Now that you have downloaded the app, tap the icon on your device.
Step 2: Browse and Login
If you aren't interested in a recipe for pizza rolls (Shame! Shame!) Then you can press "Categories" in the top left" which will take you to a screen where you can, wait for it, choose categories (see image 2 if this is too much to handle)!
You should probably login now. You can do this as far as I know, in one of two ways. You can go to "You" in the bottom right corner and you will have a login option, or, like I did, you could press follow on an instructable and you would be asked to log in.
Step 3: Write Your First Instructable From Your Phone
Press the button that says share, if your not logged in yet (didn't I just tell you to do that?) then you will be asked to log in, I guess that's three ways... When there for the first time, you will get this little brochure telling you about writing instructables, you should probably read it. After exiting the brochure (you read it right?), You will be presented with four categories. The one that you want to press (or tap) is called "New Instructable" (I'd use sarcasm here but I bet by now your a bit tired of that). Continue to this step part two.
Step 4: This Step Part Two
Now that you have pressed "New instructable", you should name it and choose the category. After choosing the title and category, your screen should look something like picture 1. The first thing you see is your introduction step, so go introduce your 'ible. Bye the way the "Add Step" button does exactly what it sounds like it does.
Step 5: Adding Images.
This will load your picture album (the "photos" app, or at least a notification saying that instructables would like access to your camera roll) if you get that notification, press O.K. Now you press the images you would like to use (refer to image 1). When you're done, press "Done". Now comes the fun part, when you want to add a photo to a step? Yah, you drag the photo onto the place where it say "drop images here". Cool right?
Step 6: Save, Publish, Thank Eric Etc
If you are finished with your instructable, then you should probably publish it. To do this you press the publish button in the top right corner.
Now you should go write a nice review of the app thanking Eric and the instructables staff.