Info Path for Document Library SharePoint 2013

1.   Open Info Path designer 2013
2.   Double click on Document Information Panel or select Document Information Panel and click on Design Form right below.

 

3.     Enter URL of your document library and click Next button.

4.       Select Content type and click Next button.

5.       Now finish the wizard.

A default form will be created and then save your form and then publish the Info Path form as below.

Done!