You can follow below steps to Open Edit_default mode
jsp for Vignette Application Portal
Step 1:Open ADMIN Console for Vignette Application Portal
Step 2: Move to
Componnets-->
Portlets-->
PortletList
Step 3: Select Particular portlet from list
Step 4: Now You Can see
Defaults tab (when ever you configure Edit_Defaults mode)
Step 5: Click on
Defaults Tab, after you can see landing page for Edit_Default mode
Regards
Raju.K