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If you want to use it as a travel cup, you can sandwich the tea between the two lids. Turn the cup upside down while steeping. When finished, turn the cup right side up again, and remove both lids together.
If you want to use it as a teapot, put the leaves directly into the body of the cup. Put the filter lid on, and pour boiling water in. When your tea has finished steeping, pour into your mug. The screen will keep the leaves in the cup.