Yes it sounds quite simple to use a treadmill, get on it and run. But treadmill's instructions don't teach you the optimal way to lose that weight.
Watch this video and follow the instructions to get the best benefit out of your treadmill for losing weight.
Pay attention to the speed variation, this is important.
Watch it on YouTube: https://www.youtube.com/watch?v=rfHJ72FjDdI
Lose weight at home by using "TREADMILL" the right way!