A stop-limit order is a trading instruction that combines the features of both stop orders and limit orders. It specifies a stop price that triggers a limit order, but only executes the trade if the market price reaches or surpasses the limit price.

Click on the black SL button in the Trade Ladder, it should now be orange.

Set your limit price (how much price difference above limit)

Click on what stop price you want for the offer or bid.