Correct expression: "To have tea" - "Having tea with someone in the afternoon"
4. Managing the Additions
....it is essential to remember that milk is added after the tea has been poured, never before. Milk is added to black tea, such Assam, but Lapsang Souchong is usually enjoyed with a slice of lemon. Sugar is added last, after the milk, and the tea stirred by moving the teaspoon back and forth in an up-and-down motion -- avoid large circular stirring motions which can, in some company, be seen as inelegant. The teaspoon is placed lengthways along the back of the saucer.
5. How to Drink It
Sit up straight and spread out the napkin on your lap. Hold the cup by the handle and bring it up to your mouth -- avoid leaning forward to drink. Never cradle the cup in your hands and avoid raising your little finger. Take small sips and don't slurp, and or blow on hot tea to cool it. The cup is put down on the saucer in between sips.
source: HuffPost.com - 2015