You will use the same instructions as the main domain in our article How do I publish with iWeb? but using the subdomain in place of the main doamin name.
I do recommend making a copy of your public_html folder for insurance before you attempt to set and test your publishing as iWeb is very quick to default and write over the main area if there are any mistakes.
I hope this answers your question. If you have any more questions or information specific to the issue please leave a comment below so we can further assist you.
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