How do i sharpen maybellines vivid and smooth liner by eye studio?it bas become blunt.pls help?

if its a pencil, just a regular sharper will do it ( but make sure it is one that is designated for makeup only) ... if it a roll on eye liner.. then on the back of it ( the end of the pencil) see if you can pull that off, usually that little thing is the sharpener for a roll on!