How do I set a maximum character count per field with Address Ninja?

Open Address Ninja from Apps in your Shopify admin. On the home page, click Limit characters per field. In the Limits card, enter the maximum number of characters in the Limit field. Select the fields the limit applies to: Address line 1, Address line 2, City, Company, First name, Last name, and Email. A new limit starts with the address fields. Select Email to include it. Under Countries, choose All countries, Only these countries, or Except these countries. To set a different limit for other fields or countries, click Add another limit. Click Save and turn on. To change the error message, open the Error message card. At checkout the message ends with the limit, for example (max. 35). This rule is included in the Pro plan.