How to add system field to all doctype?

I want to add a filed (createdby) to all doctype,and to display it .
which steps should I take?


-you can go to one by one doctype and add field
-open Respective Doctype .
-Add label and field type

For more details refer following link:-

Shraddha Ranjane
New Indictrans Technologies Pvt. Ltd.

@doracl You do you need to do that ?
By default the timeline shows who created the document.

Yes,but I want to display that in all the form, not the bottom.