AHi all I am sticking at royal icing sugar , I don't know how to decorate with it , how much water I have to add on it to pipe with it ,or I have to add another thing instead water to use the royal icing sugar for piping ,

Are you using egg whites or merengue powder?  I add 3 TBS merengue to 4 cups flour and then it says 6T water, but it's more like 7 or 8.  Beat for 10 minutes on high.  

AIt is Egg whites Thanks for reply