How to delete images ?
When trying to delete image in Images > Manage > you select an item or more with the check box in front of the image name :
Once you clicked on the red cross to delete, you should get the following pop-up window:
In case you can’t see this message you need to enable the pop-up blocker in your browser. You can enable this in the Settings of your browser by choosing > enable pop ups blocker or similar, depending on the browser you are using.