Hello Janielu

Good Day

Thank you for publishing in Microsoft Community. We are happy to help you.   

Based on the description you have shared; we understand that you want to Add a business email onto free outlook.

->May I please verify the type of account you are using? Is it an M365 work/school Exchange/IMAP/POP account or a Microsoft/personal account like Hotmail/outlook.com?

->Also, may I verify the outlook version you are using? (File >Office Account) What version of Outlook do I have? - Microsoft Support Please share a screenshot like below.

Since you posted in the classic outlook category and if this is the version you are using, I can guide you through the process of adding your email to your existing Outlook account. Here are the steps:

1. Open Outlook >Click on File, and select Add Account
2. Enter your business email address
3. Drop down Advanced Options and check the option: Let me setup my account manually >Click on Connect
4. If prompted, enter your password for the account and select Done

You can also refer to this article Add an email account to Outlook for Windows - Microsoft Support

After that kindly restart the outlook.

Please note that our initial response may not always resolve the issue immediately. However, with your help and more detailed information, we can work together to find a solution.

We look forward to your reply. We will continue to assist you based on the information you provide. I sincerely appreciate your patience and cooperation. 

Thank you in advance for your understanding.

Sincerely,

Shajia Afrin | Community Moderator