From the email compose window, or email template, simply highlight the text you want to turn into a link:
Then click the link icon, and enter the URL of the page you want to link to, and click Done.
How do I add images to emails?
From the email compose window, or email template, put your text cursor where you want to insert the image. Then click the picture icon, and select an image from your computer.
Click Insert, and the image should appear in the email.