You can get the lives sent by friends and guildmates in the Gifts window. How to open this window:

Option 1
1. Go to the main menu
2. Tap the life counter in the top left-hand corner of the screen
3. Tap the Free Lives button in the window that opens.

Option 2
1. Tap the Get button in the Friends tab or in the Chat tab in the guild window.

Select the lives you want to activate or tap the Mark All button. To activate lives, tap the Accept button.

Important!
You can accumulate no more than 15 free lives. After that, you won't be able to request help in the guild chat or in the Friends tab.
Also, you won't be able to open the Gifts window if you have a full life counter or an infinite life talisman activated.