How do you address the karate teacher in general?

Answer 1

Normally you would shake hands and introduce yourself. If you are in your karate uniform a bow is appropriate. We typically follow that with a hand shake as well.

sorry inturupting the answer but u shall bou tto the master and a prayings sign and get up and shake hands

Answer 2

We call them Sensai

and when you walk into a dojo, you bow and say (pronunciation-->) ani-guy-she-mass. this is respectful and means "please will you teach me"