21 CFR Part 108 requires:
(c)(1) Registration. A commercial processor, when first engaging in the manufacture, processing, or packing of acidified foods in any State, as defined in section 201(a)(1) of the act, shall, not later than 10 days after first so engaging, register and file with the Food and Drug Administration on Form FDA 2541 (food canning establishment registration) information including, but not limited to, the name of the establishment, principal place of business, the location of each establishment in which that processing is carried on, the processing method in terms of acidity and pH control, and a list of foods so processed in each establishment.
Information on the registration process is located on the FDA website:
Forms and Instructions for Paper Submission of Establishment Registration and Process Filing
Instructions for Electronic Submission of Establishment Registration and Process Filing