How do I track my Garmin Vivosmart 5 device with MyFitness Pal website?

Hi, I was able to record my first day accurately, but can't figure out how I did it. I definitely have it connected to the device, and I can view the calories from the Garmin Connect website. I just can't figure out how to record the exercise on the MyFitness Pal website. I don't have the app, I use the website, and I don't have a cell phone. Can anybody help?
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