The link given below will take you to a logon screen that requires you to enter your username and password.
The username is your email address, e.g. barney.rubble@
The password is your normal password for your email account.
Click on the OK button.
You are then presented with another logon screen that has all the right bits filled in already so just click on the Log In button.
The first time that you use webmail you will directed to set up your preferences. After that you will go straight in.