Adding Webparts to New Item, Edit, and Display Forms

If you ever needed to add a web part above a "New Item", "Edit", or "View" form in SharePoint, you will find that it is impossible using the "Site Actions" tab.

A way around this is to add:

&ToolPaneView=2 to the end of the page's URL. This will display the page in Edit mode and allow you to add web parts.

Reference: http://techtrainingnotes.blogspot.com/2013/02/add-content-editor-web-part-cewp-to.html