You can create a podcast in GarageBand and send it directly to iWeb.
In GarageBand, create the project and add features to your podcast if you want—artwork, web addresses (URLs), chapter titles, and so on.
See GarageBand Help for specific instructions about creating podcasts.
Choose Share > “Send Podcast to iWeb.”
iWeb adds the podcast to your existing podcast page as its own entry. If you don’t have a podcast, iWeb creates one for you. If you have more than one, you can choose which one to add the podcast to.
Republish your website by clicking the Publish Site button in the toolbar at the bottom of the iWeb window.
After you publish your site, visitors can listen to your podcast by clicking it.
The Podcast template includes a “Subscribe to Podcast” button on the main podcast page. When visitors subscribe to your podcast, new episodes are downloaded automatically to iTunes on their computer.
Important:Before posting anything to your website, make sure you own the copyright and other rights to what you or others are posting, or that you obtained all necessary permissions.