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Tap the Candy Crush app icon (mobile) or go to the Candy Crush Saga page (desktop). If you aren't logged into Candy Crush with Facebook, you'll need to do so before proceeding. This will prompt Candy Crush to load. Click or tap the heart-shaped "Lives" icon at the top of the page. On mobile, you must first exit to the map view in order to see this option. It's in the lower-right side of the menu. Doing so brings up a list of your friends. Tap the name of each friend from whom you want to request a life. You can also type a specific friend's name into the text box at the top of the list. It's at the bottom of the list of friends. Your request for lives will be sent to your selected friend(s).
Open Candy Crush. Select Play (mobile) or Play Now (desktop). Select the "Lives" icon. Select Ask friends. Select friends. Select Send.