You will need iFile. To get iFile open Cydia and add
http://repo.beyouriphone.com. Inside the repo scroll down and find iFile. Download and install.
1) Open Cydia and add the source:
http://repo.beyouriphone.com2) Go to the be your iphone repo and scroll down to iFile. Download and install.
3) Open ifile and navigate to /Private/etc
4) Scroll down and open master.passwrd. Click edit and scroll up to root: