To add internal links on Joomla, follow these steps:
1. Login to your Joomla admin panel.
2. Create the content you want to link to or locate the existing content you want to link to.
3. Highlight the text or image you want to make into a link.
4. Click on the “link” button in the editor toolbar.
5. In the “link URL” box, type in the URL of the internal page you want to link to or click on the “browse” button to search for the page in your Joomla site.
6. Click “Insert” to save the link.
7. Save and publish the content.
That’s it! You have successfully added an internal link in Joomla.