Inserting a Link
First type out the name of the link - It is best to use a meaningful name, rather than 'Click me' or 'Click here'
Then highlight name of your link, and then click on the 'Insert/edit link' button
In the popup window that comes up, put in the full url for your link.
Unlink Your Link
To get rid of the link you have on your page, highlight the link and click on the 'Unlink' button.