In certain situations, you'll need to send a message to several, or even all, of the members of your site.
Sending a message to multiple users.
(or you can click on the + sign next to the menu item 'Messages' from any site page);
4. Type your message into the 'Message' field and attach media if needed;
5. Select the first user from the list or type the first few letters of his name;
Note: you can add more recipients by entering their names in the search field.
You can send a message to all active site members by choosing Message to all active members from the recipient list.
Remove a recipient by clicking the 'x' icon near his name.
6. Click the 'Send' button when you are finished.
Once you send the message your recipient(s) will get a notification.