My grandaughter prepared the BC for me last weekend. It came out so hard (maybe she did not use the exact recipe). I thought about adding some butter or Crisco to it, but have no idea as to how much to add. I have 6 batches of it.... thank you!

You should be good adding the Crisco or butter. Honestly, just add a little at a time until you get it to where you want it. You're going to have lots and lots of icing on your hands!! Good thing it keeps forever.

When you state that it's "hard" - do you mean stiff or do you mean like parts of it are solid? If its stiff - just add a little water to it until you reach the right consistency. Alot of people that are newbies to icing usually don't' add enough water and then you could stand a mailbox post up in it and it would stand straight. If you could be a little more descritive it might help. That's alot of icing to have to pitch in the trash.

When I had this problem I added Karo (corn syrup) - just streamed it in a little at a time as it beats until it is the right consistency.

I'm a newbie too, but when I had this problem it was because I was using all Crisco, which tends to make the frosting extra stiff.

Don't add water if it's not a recipe using water to begin with. Add milk if you want to go that route.. but water will curdle it. At least that has been my experience with waterless recipes.

Yes, Cali4dawn is correct - I should have used the word "Liquid" instead of assuming you use water in your icing recipe as I do. Sorry for the assumption Good luck with whatever liquid you use.