Enter a subject for your message in the Subject field [1].
If you are sending your message to multiple users, but do not want users to see who else was included in the message, click the Send an individual message to each recipient checkbox [2]. If your message includes over 100 recipients (including you as the sender), this checkbox will be selected by default.
Type your message in the Message field [3]. All content is sent in plain text. Any URLs included in your message automatically become clickable after the message is sent.
To add an attachment, click the Attachment icon [4].
To add a media file, click the Media File icon [5].
To send your message, click the Send button [6].