Having checked that your your number lock is on, which it normally is by default, hold down the Alt key, then press 3 on the numeric keypad (not on the numbered keys above the letters). Then release the Alt key.
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On the taskbar right above where you are typing the new message are all the tools to change the message, from different fonts, sizes, colours, boldness, italics and the like
the last button is a yellow smiley face, click on that, and it opens a little rectangle where there are fun things to add into the email . and one is a red heart