Hi

I've moved your thread to a more appropriate section of the forum.
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Usually with frozen foods, you can thaw some in a cup of tank water. How you feed and how much depends on the type of fish and food.
For instance with my bettas, I feed thawed frozen blood worms. I thaw a few and use a toothpick to drop them one by one in the tank. That way I know none are floating down to soil the water if they don't find them.
With Frozen
brine shrimp, I thaw in tank water and dump some in for the fish in my 30g to enjoy. With the bettas, again, I feed one by one.
Frozen daphnia is thawed the same way. Since it's so tiny, I just dump a little in the tank.