Greetings:
1: Port Number does matter. 3306 is the default biut you need to make sure you check with your system administrator (your host) to confirm.
2: The address you need to log in with is your login It will add @yourmachine and try to log you in.
3: It sounds like from your description that the machine you are trying to connect to is not running Mysql. If it is running mysql then it may be running it on a different port or not allowing it to connect to the IP address you are trying to use.
Suggestions:
1: Contact your host and find out the ip address or machine name you need to connect to:
2: Find out your login and password
3: Try connecting again.
Documentation for mysql can be found at http://www.mysql.com
HTH,
=C=