Rick click the displayed variable on the screen and select "Slider". Right click it again and select "Set min and max" to set the minimum and maximum numbers it can go to.
Offline
First, click on the little checkbox next to the variable name, to make it display on the screen (if it isn't doing that already). Then, Right-click on the variable (opt-click for Mac users) and a menu should appear to allow you to turn it into a slider variable. Right-click on the slider and you can set the slider range. Hope that helps
Offline