[X Newbies] Help, Mail(?) not downloading mail

[Carol Weber Mckee]

>
> Check your preferences in mail to see how they are set.  You may be 
> down loading email but not deleting from the server.
>
> jerryw
>
>

I don't see any preferences in  my mail.  I have to delete by going to 
Mailbox or by  the Apple (Command?) and K keys.
Carol