To delete an image you have uploaded to Website Publisher, open up an editor interface for any piece of content by either editing an existing article (blog, web page, news) or by creating a new one, then click the "Insert Image" button on the toolbar.
In the Media Manager dialog open, you should see a button which looks like a document page with a red X overlayed on top of it - this is the Delete Selected File / Folder button. Simply click a file to select it, then click this button to delete the selected file.
If you do not see the aforementioned button, this is because by default this is not enabled in Website Publisher.
To allow control panel users to delete image, go to the Settings section and under Misc Settings find, and tick, the checkbox for "Enable Image Delete?". Save the settings and then repeat the above steps for deleting the image.
