If you need to include any kind of script at your form, to perform dynamic actions, you can enter your script at javascript events tab. There you can place any javascript code needed, with different sections to include the code:

You have some helpers available to handle input fields you have at your form. You will find some tips at the left panels explaining different predefined functions you can use.

Look for more tutorials where we will share some code tips regarding the main code or this js section in order to add complex functions to your form.