If you can add HTML, you can embed appointment scheduling into your website. For Joomla there is a good reference at http://support.powerdnn.com/KB/a50/how-to-add-html-code-into-a-joomla-article.aspx covering different ways to add HTML into Joomla.
The code that you'll need to add to your site is available in your Client's Scheduling Page section.
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