To have security access to uninstall a module, you must login as the host manager account (default name is host), go to the host menu and select the Module Definitions.

Inside the Module Manager, edit the module by pointing the mouse to the edit image (pencil) next to module name. Towards the middle of the page, check the "Delete Files" checkbox if it's available and then click on Uninstall link.

Your module is now uninstalled.