Pokémon Trading Card Game Online/Game Menu/Social Menu/Friends Tab

By selecting the head silhouette image next to a "Friend"'s screen name, players are provided with several options: "Challenge Friend To A Game" (lightning with two head silloettes), "Private Message" (word bubble with three dots), "Remove Friend" (minus sign with head silhouette), and "Block And Ignore Player" (circle with strikeout line).