Open AltStore, tap the "+" button, and select the downloaded Wolf IPA.
: Disable "Seen" receipts for messages and hide your "typing" status in Messenger. Facebook & Wolf Hack
Because this is a third-party modification (a "tweak"), it is not available on the official App Store. It is typically installed as an on non-jailbroken devices or via a repository on jailbroken ones. Open AltStore, tap the "+" button, and select
: Use a tool such as AltStore or Sideloadly to install the IPA onto your iPhone. tap the "+" button
: Supports biometric locking (Face ID or Touch ID) for the app. How to Install and Use (iOS)