I have uploaded XDP file on AEM Form 6.4, there is a possibility. So can I edit XDP file .
I have no properties als Edit seen
You cannot edit the XDP from forms portal(the screen that you are currently on), please download the same and open it in AEM Forms Designer to edit it. Once done save it as an XDP and re-upload the same XDP to the server.
Let me know if you have any query further.