Okay...I filled in my username and put in the password as instructed, and now not only am I able to send and receive email, but I can also send attachments.
I thank you all for your help and patience.
However, now I have a new problem. I have 2 email addresses for my small business. The first I was able to receive email okay, but it's a different story with the second; yet they're both set on the same server with the exact password.
Here's the setting for the second address:
description: <not specified>
Server Name: smpt.secureserver.net
Port: 25
User Name:
[email protected] Secure Connection: none