Whey protein is simply a convenient, fairly-rapidly digesting source of protein that you can use in addition to your food intake to reach your protein intake goals for the day. Because of its relatively fast digestion, its ideal in the morning, pre and post workout, but can also be used at any other time during the day you would like to bump your protein intake higher. Do not think of it as some sort of special supplement in an of itself; its convenient food. Just treat it as such.
Just so you know...it may take your system a few days to get used to it. I remember when I started using whey, I was dropping bombs like a mad man...hahaha...I KNOW I'm not the only one.
As far as timing goes, personally, I take 2 scoops post workout and 1 when I wake up. I just mix it with water. Grow! is a good product...I just switched to it after a year with ON, and I like it waaayyyyy better.