Creating webforms


I've created a new webform in AX40. 
But how do I create or retrieve the aspx page from my newly created webform. 
When I try to create an URL to link my new  webform to a menu and I look into the URL section,
 I see all the existing webforms (under page definition) located there except the new webform I created 
so I can't import my webform as a page to an URL.
thanks in advance