Stop orders are submitted on the opposite side of the market than normal Limit orders. A buy stop order is submitted at a price higher than the current best bid but does not fill until that price trades. A sell stop order is submitted at a price lower than the current best offer price.
Stops are useful as loss limits as you can use them to close out a position automatically if the market goes against you.
Stop Limit is a stop order in which you place a limit on how many tics from the trigger price you are willing to let the order run.
You can check working orders, fills, and positions by tapping on the appropriate icon in the Monitoring Trading Activity