Here's how to send a post. Start by clicking the home or news feed tab, then click into the what do you have to say field. The body of the post can typed, just like a social media feed. You can also add a photo from your device or up to ten resources from your ExpandShare library.
There are options turn off or on comments and notifications, and you can even schedule when your message will send and expire.
The audience selector lets you target just the locations and roles you want to message, and will always show you how many recipients your message includes.
Now all that's left is to click post. And that's how you send a post.