Increasing/Decreasing a Value 19 1. Select [Buttons] – [Button] in the Toolbox. Drag and drop it to the page. Toolbox. Drag and drop it to the page. 2. In the [Events and Actions] tab page, select “click” as [Events] and “IncreaseVariable” as [Actions]. Then, set a target variable in [Variable] and an increment value in [Value]. 3. For subtraction, select “DecreaseVariable” as [Actions] and set a decrement value in [Value]. 4. You can indirectly specify the increment/decrement value by setting a variable instead of a fixed value in [Value].