I just made my first app for facebook and this app should post sth. in my feed.
Everything is ok but at the top of this message there stands the appname.
How can I hide it?
As others already pointed out in the comments, this is not possible. The only scenario where the name would not be shown to regular users is if you're posting as a page, then the name is only visible to Page Admins but not regular users.
As others already pointed out in the comments, this is not possible. The only scenario where the name would not be shown to regular users is if you're posting as a page, then the name is only visible to Page Admins but not regular users.