Hi NewOrleansDude,

You can add a secondary account from MSN in five steps

Step 1: Sign in to MSN using the primary email account.
Step 2: Click on Help & Settings menu, now click "Accounts & Billing".
Step 3: Click "Add member accounts".
Step 4: Type in the e-mail/password if you already have an existing MSN or Hotmail e-mail address, and click "Continue". If you choose "Create an MSN.com e-mail address for the new member" you will be re-directed to create a new account. Follow the instructions to complete account creation.
Last Step: Type your name in the box and click "Accept", click "Close" to return back to the main menu. Note: If new user is 12 years old or younger you will have to provide consent and sign the agreement before continuing. You have successfully added the account as a secondary account.

Thanks,
Nitesh