I'm not familiar with this platform but usually you can find the details from jmp help page. Use Help (?) tool from toolbar and hover over to your point of interest and click (in this case Power Analysis), this will open help page close to where you want to be (usually)
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Then start searching the page you get Design of Experiments Guide > Evaluate Designs > Evaluate Design Window > Power Analysis
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Click link and hope that it takes you further Design of Experiments Guide > Technical Details > Power Calculations .
Or in this case I think you have to go a bit further on the first page
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Hopefully this at least provides some location for correct documentation
-Jarmo