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.