Hi Nikki

I made some cupcakes yesterday, and for the first time my icing set nicely when i piped it on. I just used a bag of homebrand icing mixture - about 500g and added about 4 tablespoons of butter and a little milk at a time. I put a bit of hot water in the sink and sat the bowl in there while i was mixing it. A friend of mine makes fabulous cakes and this is the way she does it too. She actually puts the icing in the fridge first too.
Hope you can get it to work