Hi, wonder if anyone can advise? I did a beer kit today and followed instructions religiously. The last bit was to sprinkle the enclosed yeast on the surface of the brew once temperature down to 24C. I did that and sealed it with and airlock but six hours later its doing nothing. I was expecting bubbles to be flowing through the airlock. Any advice how I can get it fermenting? Thanks. Its my first attempt. I sterilised everything.