The Order Contingencies dialog shows all the contingent orders which were placed in the application (and haven't been executed yet).
In order to get information about your contingent orders, modify their settings or delete them, you should use one of the following buttons from the right side of the window:
Show Contingency Details
Double-click on a row if you need to edit a contingent order. Keep the Ctrl key pressed and click on different rows with your mouse for multiple selection. This can be used if you need to delete more contingent orders at the same time.
The Order Entry Symbols Legend is presented here.