Polite Emotes are not passed on automatically to players. Instead, players must earn them by completing the East Luterra continent side quest With Grace and Elegance. Begin the quest by going to Luterra Palace in Luterra Castle and accepting Anessa's side quest.
Anessa is an expert in court etiquette and will teach the player the Polite Emote. To learn it, enter your Inventory by pressing I and right-click the book named Emote: Polite. Once you have learned it, enter /polite into the chat to perform it.
This is then bound to your character and can be done anytime during the game. To complete this part of the With Grace and Elegance quest, you'll need to use the emote four times in front of Anessa before she will be satisfied.
If you don't know all of your character's emotes, you can find them in the Community button on your screen. You will see Emote between Voice Chat and Guild once Community is opened. Alternatively, The hotkey for Emote is Y. You will see all of the emotes your character knows in this window.
Keep in mind that the quests Becoming a Queen and Page Turners are prerequisites.