CREATE USER 'repuser'@'%' IDENTIFIED BY 'reppass';
GRANT REPLICATION SLAVE ON *.* TO 'repl'@'%';

CHANGE MASTER TO
master_host='10.20.30.40',
master_port=3306,
master_user='repuser',
master_password='reppass',
master_log_file='dummy',
master_log_pos=1;

START SLAVE;
DO SLEEP(10);
SHOW SLAVE STATUSG