Actors

Hi im fairly new to game creator and i wanted to know how to get this white thingies off my sprite.
if you look carefully you can see grey (my arbiter sprite) and white bits around it (the bits that are not supposed to be there)
Does anyone know how to get rid of this?
Thanks
Twigser
if you look carefully you can see grey (my arbiter sprite) and white bits around it (the bits that are not supposed to be there)
Does anyone know how to get rid of this?
Thanks
Twigser