Turn on the HRM so it reads your HR.

wait 'till the HR appears in the display.

Depress the lower right hand button until the center line of the display reads your MPH (or KPH.)

Depress the upper RH button until the top line of the display shows your cadence.

You now have cadence on top, spd in the middle, and HR on the bottom line.

MH

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Tech writer/support on this here site. FIST school instructor and certified bike fitter. Formerly at Diamondback Bikes, LeMond Fitness, FSA, TiCycles, etc.
Coaching and bike fit - http://source-e.net/ Cyclocross blog - https://crosssports.net/ BJJ instruction - https://ballardbjj.com/

the only problem with that is that the bottom line is showing heart rate as a % of max, not just plain old heart rate.

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Mike Plumb, TriPower MultiSports
Professional Running, Cycling and Multisport Coaching, F.I.S.T. Certified
http://www.tripower.org

To take it out of % of Max mode PRESS and HOLD lower right button until view changes to actual HR.

Jim

Go to:

http://www.polarusa.com/manuals/S720i.pdf (Its also for the 710)

and download the manual, it can save you a lot of questions about functions.

Make sure you are in record mode (stopwatch runing) when you press and hold the lower right button, it only changes the active bike when in measure mode.