How to edit User Doctype

[Mubasher]

Hi there

i m trying to customize the user doctype and add signature but it say core doctype cannot be customized

[Ishtiyak]

How to make changes in User doctype

I want add some more fields in my User doctype. then i can do the process while creating a user. but when try to customize the User doctype it says the core doctype cannot be customized. So i want to know is there any way to make the process without editing Core doctypes. My objective : i want to add some more fields while creating a user. for the specific role user manager.

check this post