If you are hosted by OCLC, you will need to contact OCLC Support. We will work with you to do the following:
If you are self-hosted, you need to look at the documentation for Populating a UserValidation Table and How does the UserValidation table work in ILLiad? You will need to load the files to the UserValidation table. When the patrons sign in the first time, the information from the table will be loaded in the Registration form.