To open a page in a new tab. You must add the code [target="_blank"] at the end of the hyperlink url.
For example:
<a href="http://yoursite.com" target="_blank">YOURSITE</a>
Using _blank will tell the browser to use a new tab/window, depending on the user's browser configuration, and also depending on how they click on the link (middle click, ctrl+click, normal click).
