Tosay"I'mgoingtopianolessons"inEnglish,youcansay"Ihavepianolessons"or"I'mattendingpianolessons."Tosay"Ihavepianolessonsintheevening"inEnglish,youcansay"Ihavepianolessonsintheevening"or"Itakepianolesso
To say "I'm going to piano lessons" in English, you can say "I have piano lessons" or "I'm attending piano lessons."
To say "I have piano lessons in the evening" in English, you can say "I have piano lessons in the evening" or "I take piano lessons in the evening."