Question about Outlook Express

I have my son setup as a child account under my Microsoft account. He uses it to log into to our Xbox, and our Surface. He just got a new Windows Phone 8, and I used his MS child account to setup his phone. Everything mostly works as expect so far - a few more hoops to jump through compared to setting up and using my Windows phone using my parent MS account. The problem is this. On the PC, when he logs into Outlook.com and then goes to the People Hub, he is unable to add, or edit any contacts. In fact, the only way he is able to add a contact is by typing them into the phone...once done, those contacts will appear on the PC within Outlook.com's People Hub. This is just **** backwards. Obviously, adding loads of contacts on the phone is less desirable than on a PC. How do I get around this so we can add contacts using a real PC instead of the phone.