After clicking New Message, you will be presented with the screen below where you can enter the following
If the New Message pane opens beside your email list then you can make it larger by clicking the "Open in new window" icon as shown circled below

Recipient |
Here you enter the email address of the recipient or click the
The Cc button can be used to send a copy to other recipients where all recipients can see who it has been sent too, whereas the Bcc button hides additional recipients (which is what you should use if sending to multiple recipients) |
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Add a subject |
Here you enter the subject (title) of your email message, it is advisable not to leave this blank as many email systems will treat it as junk mail (spam) |
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Toolbar |
Use this toolbar to format your message i.e. change font style, font size, bold, underline text etc |
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Message |
Here you type the main body of your email message |
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Insert / Attach |
Click the Attach icon (the one which looks like a Paper Clip) to attach a file from your computer (or OneDrive) Click the Insert pictures in-line icon (the one which looks like a picture) to insert a picture into your email message Click the Insert emoji and GIFs icon (the smiley face) to insert a emoticon into your email message Click the ... to insert signature and to change other message options |
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Send / Discard |
When you have finished composing your message click Send, or click Discard if you no longer wish to send it |