On Delivery areas & pricing choose Import a spreadsheet (about 10 min, use your own list). Press Download current list to get a CSV in the exact format (it contains whatever zip codes the selected kitchen already has, so on a new account it is a header-only template). Fill in your zip codes and delivery fees, then drop the file on Drop your spreadsheet here, or click to choose a file and press Import. The result reads Imported N zipcode(s), N error(s); rows that cannot be matched are skipped and counted as errors. The file must be a .csv (File must be a .csv) and all rows are imported for the currently selected kitchen. The same import exists on the Delivery Settings screens outside the wizard.