How do I delete Snapchat messages before they are read?

Snapchat added the ability to remove your message, how do I do it?

Snapchat has added the ability to delete messages, which is good news since we've all had messages we've sent and instantly regret. If you are quick enough, you might be able to delete your message before everybody or even anybody reads it. Simply long press on your message until a list of options pops up. Tap Delete.

How to delete Snapchat messages before anybody reads them on iPhone and iPad.