Go to parental controls i think you will find it there, or contact Nintendo 
or you can delete it
What Can I Block With Parental Controls?
Important Note!
- Restriction options are dependent on the availability of system features. A System Update may be required for a complete list of options.
Answer:
- Adding users and formatting system memory are restricted automatically.
- You can chose to restrict the following Wii U features:
- Game Rating: Restrict all usage (as well as purchase through the Nintendo eShop) of software exceeding the rating level of your choice.
- Online Interaction in Games: Restrict both the use of online features and the exchange of content over the Internet.
- Internet Browser: Prevent use of the Internet browser.
- Wii U Shopping Services: Restrict the use of credit cards or the purchase of software through services such as the Nintendo eShop.
- Miiverse: Restrict users from viewing or posting content.
- Friend Registration: Prevent the registrations of friends.
- Entertainment Excluding Games: Restrict the viewing of video content, both streaming and stored on physical media such as discs, and software with video-playback functions.
- Data Management: Restrict the deletion or moving of software or save data using Data Management.
- Internet Settings: Restrict the addition, modification, or deletion of Internet settings.
- You can chose to restrict the following Wii features (Wii mode):
- Game Rating: Restrict all usage (as well as purchases through the Wii Shop Channel) of software exceeding the rating level of your choice.
- Wii Shopping Services: Restrict the use of Wii Points.
- This does not restrict the purchase of Wii Points of the downloading of free software.
- Certain Online Features: Restrict the use of some online features and the exchange of content over the Internet.
- Viewing of Unrated Content: Restrict the viewing of videos in software that does not have an age rating.