Question: how to change my wifi password on my apple router?
Answer: Launch Airport Utility.
Tap the AirPort icon.
If you are prompted for a password, enter the current password (that is, the same password you use when you try to connect iPads and other devices to this Airport).
Tap Edit.
Tap Base Station. ... 
In the Password field, enter the new password. ... 
You're prompted to update.