You can use Market Bet Wizard to place back or lay dutch bets on your selections manually. If you have got your betting model for dutching and you want to automate your betting then you can use custom bot trigger to place your dutch bets automatically.
In my video I show how to use custom built bot trigger using the bot: Execute Trigger Bot
You have got two options when dutching:
1) Leaving your bets without closing your bet position, in such case you should apply some kind of staking plan.
2) Closing bet position, either in a profit or in a set loss target.
At the end of my video I closed my betting position by using Market Hedge Button, clicking on this button closes all open bet positions at current offered price.