Dutching horse racing

[rogerlisa]

Whilst dutching a horse race I may wish to trade out using the one click screen under trade profit. I used to beable to do this but for some reason there is an na in all the boxes. I have obviously clicked something in the settings but cant find out what. I know some might say ' why trade out '? Its just a safe guard thats all. Also does anyone have a link to a good video showing good usage of the 'margin maker' as cant seem to find a good one. Thanks in advance.
Roger.