Cant find source code under publish section, is there any solutions?

cant find source code under publish section, is there any solutions?

The "source code" embedding option is only available for classic forms layout. So, if you are using a "cards" forms type, you won't find it, as it is not available for it.

https://www.jotform.com/help/491-How-to-Create-a-JotForm-Card