Care to share seller?
Anyway, that bag probably has loose leaves inside. You cannot really prepare the tea (that well) without proper tea equipment. I am going to suppose you have a tea set.
-First, you want to warm water enough (in a Tea kettle or some other closed metal utensil used for boiling) that it begins to boil; and as soon as it does, turn off the heat. While it heats, do step 2
-Take your teapot (different from Kettle) and place hot water from your faucet inside, so that the teapot (be it clay, metal, or ceramic) can heat up. Do the same to your tea cup. This way, the tea will not cool down when you pour it in either.
-Once the water begins to boil, do the following as speedily as possible (I don't mean in two seconds, but don't take 5 minutes either)
*Pour the faucet water out of the teapot and if you wish, dry the teapot a bit (with paper towel).
*Add tea (the leaves inside the bag, silly) to the teapot. Approximately 1 heaping teaspoon per 8 ounces of water. (That's why it's called a teaspoon.) Or just add as much or little as you like. More tea=stronger tea.
*Add the water to the teapot. (Don't use the infuser (the little mesh) that comes with the teapot, let the laves freely travel around the water). We will use the infuser later.
-Steep for the appropriated amount of time. (Steeping is a fancy word for "leaving the tea leaves inside the teapot with your boiled water so it can turn the water into tea").
For green tea, steep for 2-3 minutes. Doing it longer will cause your tea to bitter.
-Pour the tea (stuff in the teapot) into the teacup which should now have its faucet water emptied. Make sure you pour through the infuser so that the tea leaves will catch in the mesh and not stay in your tea. You don't want leave sin your tea when you drink.
Drink. You can add honey if you wish, or sugar. If you want to add milk, to make it less watery, make sure you have the milk in the teacup before you pour in the tea. If you pour in the tea, and THEN the milk, the milk will burn (because the tea is hot) and curdle. Finally, if you use milk, do not add lemon. Milk and lemon cause a chemical reaction that also curdles the milk.
Now, if the thing is just a tea bag, then heat some water in a cup, pop that sucker in the cup and remove bag after 2 minutes. Done.
By the way, is that Asuka RealAction like a larger Revoltech. I'm not really one for buying dolls or action figures (other than Figmas/Revoltechs), so I am curious.