: Enabling the built-in Messenger functionality within the main app, bypassing the need for a separate app. Feature Restoration

: Provide your Apple ID email. This is used to "sign" the app so it can run on your device.

: Before proceeding, understand that downloading patched IPA files can expose your device to security vulnerabilities. Patched apps often bypass security measures and can be modified to include malicious code.

: Plug your iPhone or iPad into your computer via USB.

If you still want to proceed, I've provided some general information. However, I strongly advise against downloading or using patched or modified IPA files.