A Readmore tag has been added to the article but is not showing in the front-end.
The Readmore option must be enabled in the Article Manager Options
Joomla! 1.5
- In the Article Manager, click on the Parameters button
- Set the Read More...Link option to Show
Joomla! 2.5
- In the Article Manager, click on the Options button.
- Set the Show "Read More" option to Yes
Joomla 3
- In Articles, click on the Options button.
- Set the Show "Read More" option to Show
A readmore will only appear in a blog layout
As listed in the Joomla! Documentation - Splitting an Article into an introduction with a link to read more :
The "read more" function works only in articles published in blog layout.