How do I inject CSS to Cards layout form?

I'm trying to find this and even upgraded my plan thinking i needed to do that to do custom CSS to style my form to match my site but i still can't find this feature anywhere ,and all the CSS i'm trying to add to my form isn't working. please help

Are you trying to inject CSS in a Cards layout form? Please be noted that it is not possible to inject CSS in the Cards layout form.

You may switch the layout to a Classic one:

https://www.jotform.com/help/493-How-to-Change-the-Form-Layout

You may create a multipage form in the Classic layout form:

https://www.jotform.com/help/119-How-to-Create-a-Multi-Page-Form-with-JotForm

Let us know if you have further questions.

Thanks