Good day, jacqueline.doory,
You might want to check online for the correct postal code. The Eircode varies per address.
You can visit this website to find an Eircode: https://www.eircode.ie/.
Once you have the Eircode, you can sign up here, https://quickbooks.intuit.com/ie/.
You can check these articles for future reference:
Please stay with me if you have other concerns.