What are you using?

I'm using ______ and I want to ______. Please give me the exact steps, in order, naming exactly what I tap or click at each step and what the screen should look like after. Assume I don't know any of the technical words. Give me the steps one screen at a time. If a menu might look different depending on my version, tell me what to look for instead of a specific name. At the end, tell me how to undo it if I don't like it.