Thank you; I've just had a look at the config.php settings and know where to put it.
I've got one more question though.
It says you have to add in a line for your old password salt so that current users will be able to login as normal the next time they use moodle.
Is this only relevant for existing password salts, or do I also need to add in a line to reference my existing database password.
Just to be sure, can I just leave my password where it is and add in the password salt because I don't have an existing password salt?
I want to make sure I get it right to avoid all of our users from having problems logging in.