To be able to remove module from the extensions list go to the Admin Panel-> System -> Magento Connect -> Magento Connect Manager:
Among the already installed modules find the necessary position and by using the triangle option open the drop-down commands list:
Confirm the action by pressing the appropriate option :
A system window will appear towards the bottom of the page that will display the progress of the uninstall process. Hit 'Refresh' button to update the current page.