[Koha] Modifying the Add New Patron Form/Fields

One of my client wants me to add additional fields on the patrons form for new users like Department, Unit, Section etc that are not currently included. I proposed use of extended attributes but they insisted on having them flow within the form rather than have them at the bottom. Does anyone know how I can add those fields using a JQuery code or any other means; or do I have to edit the source code and how do I edit the source code. I am using Ubuntu 14.04; Koha 3.18 installed on packages. Evan