What can I modify in "amiibo Settings" in Wii U System Settings?
You can register a nickname and link a Mii to an amiibo with the “Register Owner and Nickname” option.
The “Delete amiibo Game Data” option can be used to delete save data from the amiibo. This will allow you to save data from another game that uses the read/write functionality.
In addition, you can reset and clear all settings from an amiibo, including nickname and Mii data, with the “Reset amiibo” option.