Your Shipping Restriction Message will display on the Shipping
& Billing Details page of the checkout process. It is an
informational message you can convey to your customers.
To Edit Your Shipping Restriction Message:
Navigate to the 'Edit Store' tab. On the left-hand menu click on 'Shipping'.
After writing your message in the box called 'Shipping Restriction Message' (At the bottom), click on 'Save'.
Notes:
The Shipping Restriction Message will not display if theorder only contains downloadable products, since shipping does not apply.
If the customer enters a location that you do not ship to, the Shipping Restriction Message will display above the message of "You are not within the shipping area."
For more info on setting up custom shipping options, see these other help documents: