I'm sorry for the confusion, but only the first paragraph at the link I provided is what applies to your situation. The second section is for adding the SCLogin modal popup on the page from a link. We currently don't support adding SCLogin as a menu item, but have an issue in our tracker to investigate in a future release.The link you provided gives me an anchor tag. I know of no way to get an anchor tag into a Joomla menu. I can create a menu item with an external URL, but that's not the same an an anchor tag with a data-toggle parameter. And clearly the link changes from "Log In" to "My Account" when the user is logged in. I don't see how this change is made.
What would be great would be a tutorial showing how SourceCoast constructed what clearly works very well on this site so that we mere mortals can reproduce it. The link you provided says, "On sourcecoast.com, our Log In and Register links are not actually part of the menu. We are using the SCLogin as a module and displaying in a template position near the menu. The module has then been styled to have a consistent look with the menu and is set up to use the 'Modal Popup' view type and 'Text Links' to launch the modal."
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