After your account setup is complete, when you want to record your first EKG.
For the KardiaMobile, open the phone app, and tap "Record your EKG", then choose KardiaMobile as your recording device. Move through the flow until prompted to record.
When ready, place your pointer and middle finger from each hand on the electrodes for 30 seconds to start the timer. Hold still until the countdown completes and the recording is done.
If you wear hearing aids, please be sure to turn them off when taking a recording. When you are instructed to rotate your phone, please be sure that the bottom of your phone is by your right hand and the top of the phone by your left hand.