I want to change the teacher of square dance.

This is not a problem. Maybe you have traveled or moved out to study and run a business. In fact, you can ask about the dancer. There must be some mass students who know about it and fully understand her contact information. If you are sure that she has moved away, you can inquire about her address. If you don't want her very much, enjoy a painting. Government Square seems to be Lacey. In another case, she may change the square to teach another group of students. You should pay attention to the other squares.