They wanted the URL so they might include the post to their email newsletter using the Flashissue curation feature.
What seemed an easy demand ended up being much more tough considering that Facebook does not make it obvious where to discover the URL for post.
1. Go to your Facebook page e.g. https://www.facebook.com/FlashIssue
2. Click the Date Stamp of the post you desire to find the URL for
3. The post will pack as it's own page and you can copy the URL e.g. https://www.facebook.com/FlashIssue/posts/928107223872038
When you have the Facebook page URL you can plug it into Flashissue and drag it into your email.
If you are using the Flashissue Chrome extension you can clip the Facebook page URL for a faster way to get it in your email:.
Exactly what's more annoying is that there is no chance to discover an RSS feed for all your posts on a Facebook page. It appears like Facebook when offered this but withdrew it since it was being abused.
For the minute, you have to be satisfied with pulling specific posts as pages.
Thus the article How To Find Facebook Username thank you visiting from me hopefully can help you.