How to hide Postmypost as the author/source on Facebook?

You cannot remove, rename, or hide the app source (Postmypost) on Facebook posts. This is a platform limitation: Facebook/Meta (Graph API) records which app created a post, and third‑party services cannot spoof or hide the source.

The display of this label is controlled by Facebook and may vary depending on context (post type, where it appears in the interface, viewer role, etc.). This is expected behavior and not a service error.

Even when publishing from Meta’s native tools, the source label remains — just with the corresponding app’s name. It’s not possible to remove the source completely.