Removing companies from the Watch List can be done one at a time by clicking a company ticker from the main Watch List page (See FAQ https://www.iclub.com/faq/Home/Article?id=777) or by using the Clear Watch List link on the left hand side of the page.
Be careful on this page; if you click YES here, it will delete all of the stocks from the Watch List, not just ones that you have added. It does not impact any stock studies you have linked, but can quickly undo the work done to set up a well maintained club Watch List.