I need guidance on using my new Samsung Gear S3 for step counting

[Android Central Question]

I JUST bought a Samsung Gear S3. I am very happy with it so far. I have set my daily step goal to 10,000 steps. As part of my daily routine, I do about 4 miles on a treadmill 1st thing in the morning. Because I am not actually moving any distance, I need to add the steps into the Gear S3 after my workout. What are the steps to enter my treadmill distance?