I need help on how to fix this. My icing is seperating in my bowl. I made the black icing two days ago and it is seperating and I dont want to use it on this birthday cake. Usually I would add confectioner's sugar...but it is not working this time...How do i fix this....

I hope it's not too late. Just stir it really good. This happens a lot when icing is made ahead of time. It should be just fine on the cake as it will be in the open air and dry well.