While preforming life-saving CPR is vital, an Automated External Defibrillator can be another extremely helpful tool in restoring rhythm to the heart. The AED assess the current rhythm or lack thereof and provides a shock to the heart via an electric current the enables the heart to start or keep beating at an effective rate. Follow the steps below for proper use:
The American Red Cross:
https://www.mycprcertificationonline.com/courses/aed/types

Complete first steps of CPR (Assess scene, check for response and breathing, injuries or other life-threatening condition, and call 911)
As soon as you have the AED, turn on and follow voice prompts
Remove any clothing or items covering the persons chest and attach pads
Remove all clothing covering chest and wipe down to ensure it's dry (electricity and moisture don't mix)
Place first pad on UPPER RIGHT side of chest
Place Second pad on LOWER LEFT side of chest a few inches below the underarm (if pads touch, place one on center of chest and one on center of back)
Plug the pads connector cable into the AED (rescue ready)
Allow AED to analyze the heart rhythm
Ensure no one is touching the person/patient
Yell "CLEAR!" in a loud, commanding voice
SHOCK if the AED determines one is needed
Ensure no one is touching the person/patient
Yell "CLEAR!" in a loud, commanding voice
Hit the SHOCK button to deliver the shock (Remember hands off! No touchy!)
After the shock is delivered by the AED, or if no shock is needed IMMEDIATELY begin CPR with compressions!
Learn more, print these steps out or find a local class near you at:
The American Red Cross: https://www.redcross.org/take-a-class/aed/using-an-aed/aed-steps
AED Pads Complete Guide: https://www.aed.com/blog/aed-pads-a-complete-guide/
Being Rescue Ready: https://www.aedbrands.com/blog/why-should-pads-electrodes-always-be-plugged-into-an-aed/#:~:text=By%20keeping%20the%20pads%20plugged,device%20is%20not%20rescue%20ready.