Select the text you want to make a hyperlink, by dragging your cursor across the text or picture. This will change the color of the item you have selected, just like the picture below.
Now click the "Insert Link" button from the toolbar.
You will see a "Script Prompt" box pop up. Now enter the page (URL) that you want the link to point to. Below are two example of valid URL entries. The first would be to an external web site, as the second would be to another page on your own web site.
Next just click the "OK" button in the "Script Prompt" box and your link is finished, continue editing the page and click the "Update Web Site" button when you are finished.