How to do it...

1. From the AWS console of the master account, click on your username, and select My Organization from the drop-down menu:

1. You will be taken to the AWS Organizations console, where you will see your current account:

1. Click on the Invitations tab in the top-right of the console:

1. Click on the Invite account button. Specify the account ID (or main e-mail address) of the account to invite:

1. Once you click Invite, you will be taken to a list of invitations where you can view the status:

1. At this stage, the target/invited account will receive an e-mail notifying them of the invite:

1. Log in to the invited account and go to the My Organization link under the user menu:

1. In the AWS Organizations console, you can see the pending invite on the left:

1. Clicking on the invite, you can see its details:

1. When the invite includes all features, you will be asked to confirm your acceptance:

1. Once confirmed, you can now see the details of the organization you have joined:

1. At this stage, the master account will be notified of the accepted invite:

1. Back in the master account, you can now see the new account alongside the master: