1. Click your name tab below and choose manage my account:  
2. Scroll down the page to the "tasks" button and hover over it to click add user:
3. Once you click add user, a new box will pop up to then add this user into your account. Add in a username, email, first and last name and hit register:
4. Once you've clicked register to the right email, it will send the new member an email to login. And on your members tab in your account, this new member will show up as the last and newest user/member on your account.
5. Those are the steps to add a new member to your account.