Hi Tracey and welcome to Social Slimmers!
It should have came in a sealed tub and in the tub a measuring spoon. You should also be using any milk but cows milk.
It is 15 gram but IMO it's rubbish and don't buy another tin. I was hungry, too hungry and by the time I added all the extras to the blender I may as well have added a big blob of natural yoghurt instead for a much cheaper price.
It does work and suit many people though so whatever is right for you you will find lots of healthy tips and meal ideas here.