Click in the search field in the upper-left corner and type the ticker symbol. Press "Enter" to add the ticker to your watchlist. You can also click on a suggested symbol or click through subcategories to see more specific suggestions.
A panel will slide out with a complete list of all of the column headers to choose from.
Click the check box adjacent to the column header name. A check in the box designates that the column header is active within the watchlist. An unchecked box designates that the column header has been removed from the watchlist.