Follow these steps to set up and use the parental lock feature on your Smart TV:

1. Go to your Smart TV settings.
2. Navigate and select the parental lock selector.
3. Select a parental lock code of your choice. This code will be used to access and activate/deactivate the parental lock, so make sure it is something that you can remember.
4. Once the parental lock code is selected, the parental lock feature will be enabled on your Smart TV.
5. Adjust the preferences for the parental lock. Depending on the model of your TV, this can include the type of content you would like to restrict, the channels that you’d want to block, and/or the age rating of the programs that your TV will restrict.
6. Save your settings. Now the parental lock feature is successfully activated on your Smart TV.
7. If you ever want to modify or deactivate your parental lock, you can use the same code you selected to access the parental settings and adjust the contents.