To delete all your symbols, open the ".All Symbols" quotepage (system quotepage), and then click the red trashcan button on the quotepage toolbar. If the toolbar isn't visible, press Ctrl-T once or twice until it appears. You must make sure that you don't have any specific symbol selected (i.e. The cursor is not placed in any specific ticker symbol cell.) To ensure focus is removed from any specific symbol, click on the "Ticker" column heading (this will cause a sort...but will also remove any specific focus.) If you have a specific symbol selected when clicking the red trash can, then only that symbol will be deleted