Parents and guardians can restrict certain features of the Wii U console through Parental Controls on the Wii U Menu.
The following features can be restricted:

Online Interaction in Games

Restricts communication features, such as uploading and downloading courses and receiving notifications.

Internet Browser

Restricts launching the Internet Browser to search for courses using the Super Mario Maker Bookmark website. Also restricts browsing webpages using the Internet Browser in the manual.