To send out a message to multiple people, go to the Messages tab.

Click New Message.

Click + Add From Contacts. From here, decide who you want to send the text to. You can select all employees, choose a department/sub department you want to send it to, or add/remove contacts individually.

Once you've added the contacts, type out the message you want to send.

You can add a salutation or a signature and/or attach a file to your message.
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When you are ready to send, click Send.

The message will be sent to each contact individually. To see a history of what was sent and who it was sent to, go to the History button in the Message center.