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This is how you brew tea: (1) Remove outer cap and tea filter. (2) Check all gaskets are properly seated. (3) Twist tea filter onto the cup to seat tightly. Put tea leaves in the tea filter. Be sure the tea filter is seated correctly. You can also put tea leaves directly into your cup if that is your preference. (4) Pour hot water up to middle of filter. Over fill may scald. (5) Properly seal the outer cap tightly to prevent leaking when used for travel. Turn upside down for quick brew. (6) Remove outer cap and tea filter after brewing and replace with slipping lid. For Best Results For maximum insulation efficiency: preheat or precool your cup just prior to use, fill with hot or cold tap water, let stand for 5 to 10 minutes and empty. Note that it comes with 3 lids: (1) Outer Cap (2) Tea Filter and (3) Sipping Lid.