You can use the url link button to open a window where you can insert your link.
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One thing you have to watch out for when using the url link button that @cleeds mentioned is that it adds the "http://" prefix to whatever you type/paste into the box. If you paste a link from a browser window you will get another http:// prefix added. If you don't take one of them out before you click "ok", your link will not work. Since I am usually pasting an address from the browser, I usually just remove the automatically inserted text before pasting the link.