Why can't i share a post to my facebook page

[Dishaforbes]

Make sure the first pull-down menu says Share On A Page You Manage. If it doesn't, click on the arrow and select this option. Next, make sure the second pull-down menu directly below displays your Page (especially if you manage more than one). ... Change the third pull-down menu to the right so you are Posting As yourself.

[Ursula]

You will have to change the privacy of your posts to make them shareable. Posts set to public can be shared by everyone.

[Rhett]

How to allow people to share your post on Facebook on a mobile device
Find the post you want to make shareable and tap the three dots in the upper right corner. ...
In the pop-up menu, tap "Edit Privacy." ...
In the "Privacy" menu, tap the checkbox next to "Public," then tap "Done" in the upper right corner of the screen.