If it's not already highlighted, click on the Accounts icon in the toolbar.
Initially there will be no accounts listed in the Description part of the window. To create your new ArgoNet account, click on the Create Account button.
The following window should open and you should enter your account and server details as shown...
The Description can generally be anything you want, and will be used to identify this account on your computer. Don't forget to enter your two letter and two digit login name where it asks you for the User name and your relevant password etc (which will appear as dots when you enter it, so make sure you've entered the correct case). Your Email Address will be your full email address and your Full name is whatever name you would like to refer to yourself as in emails sent from this account.
Although you don't specifically need to change anything, it may be worth quickly clicking on the Account Options tag at the top of the window, and you will see the following window:-
Many of the options here are self-explanatory, but make sure the top two options are ticked, or your account will be temporarily disabled and mail won't be fetched from it.
The only option here you may want to change is the Delete messages on server after downloading as this will ensure that any messages you download are deleted from the server afterwards. This will save you downloading them again next time you do a mail fetch. The only reason you may wish to leave them on the server is if you use two computers to check mail, and want to download them on the other machine. This is useful if you use a laptop as a second machine and wish to check mail when on the move.
Once you've setup all your account details, click OK and your mail client will be setup to send/receive mail from your ArgoNet account.
Lastly, you should configure Mail to send emails in the correct convention so that they will be received ok by the recipient(s) you are sending to. In order to do this, click on the Composing tag at the top of the preferences window. The following window will open:-
Make sure that the Default message format is set to Plain Text. This will ensure that people can read your email messages correctly.
Mail should now be setup to send and receive emails using your ArgoNet account. However, you may like to browse through some of the other options in order to customise your colours/fonts and personal preferences.
You can now go online and see if you have any emails waiting for you. If you have, Mail should download them and store them in your INBOX. The icon on the Dock will also indicate how many new messages were received (right).