Michael media group twitter= 1 Head into your Galaxy Watch3 Apps Tray and launch Samsung Health. 2 Scroll down the list of options and tap on Blood Oxygen. 3 Select. If you would like to add the Blood Oxygen function as a widget check out our guide Adding a Widget to my Samsung Watch for step-by-step instructions. 4 It is recommended to place your hand on a table and near RKDvmP.