There are many possibilities how-to setup a mysql replication. Here you will find a hopefully completely How-to really disable it. This is very useful for example if you want to make your slave a primary (standalone) server.
Connect to the mysql shell:
mysql -uroot -p
STOP SLAVE; RESET SLAVE; change master to master_host=", master_user=", master_password=";
And now some changes to your my.cnf
* Comment out every line starting with "master-" * add this to your mysqld section skip-slave-start
Now only a restart of your mysqld should be done.