Kenwood FP180 Blender cap not removing

If you are talking about the small filler cap in the Lid then you have to push down & turn anti clockwise. It is very unlikely to break. Spares are available if it does.If you are talking about the Lid as fitted to the jug then you should squirt abit owashin up liquid between the lid and the jug and allow that to stand for an hour or so. Then try and undo. It is unlikely to break.