1. Go to Settings > Kitchen Settings > Suppliers (/admin/suppliers) and click Add new (there is also a How to Create a Supplier video).
2. Enter the Name (required; "The Name field cannot be empty"), the Email used for order emails, the Contact Name used in the greeting, and keep Is Active? on.
3. Under Delivery window, set Delivery Window (in days) (0-30) and Delivery Date Calculation: Days After Cutoff or Days Before Delivery.
4. Click Save.

The Suppliers list has Active and Inactive tabs with counts; click an ID to edit. Inactive suppliers still show on existing ingredients.