Step 1: Find a comfortable position, preferably on a couch or a bean bag chair.
Step 2: Close all tabs and windows on your computer, including the ones you're reading right now. Don't worry about saving progress, we'll get to that later (or not).
Step 3: Stare at a blank wall, or a piece of art, or a cat video on YouTube. Explore the nuances of existential dread.
Step 4: Take breaks to grab a snack, or check your email, or scroll through social media. Practice the delicate balance between productivity and cat videos.
And that's it! With these simple steps, you'll be a master of doing nothing in no time. Start with Technique 1, if you will.