Select Extensions > Extension Manager from the drop-down menu in the Back-end of your Joomla! installation. Then click the Warnings menu item in the Extension Manager screen that appears.
This screen will display any warnings related to extensions you have installed in your Joomla! installation. Warnings such as possible conflicts in your installation or dependency failures may appear here.
At the top right you will see the toolbar:
Links to Other Screens At the top left, you will see the following five links: