To know about how to then start by launching Facebook app and click on three lines in the bottom right corner. Now, swipe down to the bottom and click to settings and privacy and then choose settings. Click to personal and account information. After that, select account ownership and control at the top. Choose to deactivate and follow the on-screen instructions to delete the account. You may need to download a copy of information from Facebook. Also, you need to delete Facebook by deleting messenger and all messages too. After deleting the Facebook, you will get 30 days grace period to change your mind.