Macro Algae

Today I purchased a Powder Blue Tang from my LFS. While there I talked to
the owner of the store as to what the new fish likes to eat. I was basically
told to feed him Nori and or other type veggie. He said that although he
will eat Brine or Mysis, he will thive on algae / seedweed.

The LFS owner also said that the Powder Blue likes Macro Algae and he showed
me something called Macro Feast, he suggested I put it in my refugium.
Seeing how I dont have one I asked if I could just pace it in the main tank.
This is when he became a politician and was unabel to give me a straight
answer. What I need to know is, what should I do with the algae I purchased
i e do I burry it , clip it to something; what do I do with it.
Thanks