The first thing you need to do is highlight your text or click on your graphic so the place holders show, as shown in pic. 1 & 2
Pic. 1 Pic. 2
Next you need to click on the insert link icon, as shown in pic.3
Pic. 3
The insert link dialog should appear, now you can either copy and paste your link in or type it in manually, as shown in pic. 4
Pic. 4
When you have typed or pasted your link in make sure that the extra http:// is removed, as shown in pic. 5
Pic. 5
When working with images, the insert link box will differ a little. If
you want to have a border around your image make sure the box next to "Display a border around the image link" is checked.
Pic. 6
Next you need to click on the insert button, as shown in pic. 7
Pic. 7
Please note that your link will not become active until you save your page or send your message