Advanced users have the option to edit the HTML source code in most Rich Text Editors.

This function has been disabled for some Title fields that already link to other pages. (eg. Gallery titles link to a gallery page).

In the Rich Text Ediors, use the edit HTML source button to open a popup window displaying editable HTML code.

 

Once you have entered / edited the HTML, Click the "Update" button which will close the pop-up window.

Don't forget to Click the "Update" button at the bottom of the page to save changes.