The Purchase PIN and the Parental Control PIN are separate. If you modify one, it does not change the other.
The Purchase PIN is found under Purchases within the Settings menu.
The Parental Control PIN is found under Parental Controls within the Settings menu.
The default for both PINs is set by each local Time Warner Cable office (typically 0000). You will be prompted to create your own, personal PINs.
To modify the Purchase PIN:
1. Press the SETTINGS button twice (or MENU button twice, depending on which remote you have)
2. Select Setup
3. Select PINs
4. Select the Purchase PIN item.