- Place your cursor over Hello - Accounts & Lists from the top right corner, as shown. 
- From the drop-down list, click on Your Prime Video, as depicted. 
- Here, click on Sign-in. 
- Click on the Profile icon to reveal account settings. 
- In the drop-down list that appears, click Accounts and Settings, as highlighted. 
- Here, click on the Parental Controls option to proceed further. 
- A text box will appear asking you to create a PIN. Enter a 5-digit number that you can remember as the PIN. 
- Once you have entered your PIN, click on Save to confirm. 
- In the Viewing restrictions panel, 
select the devices on which you wish to impose viewing restrictions. adjust the age restrictions based on your requirements.
Refer to pics given below for clarity.
- From the bottom right corner, tap on My Stuff, as shown. 
- This will open your Watchlist. Tap on the Settings icon, as highlighted below. 
- Enter your login credentials, once again, to verify your identity. 
- Type the 5-digit PIN in the text box provided on the next screen. 
- Here, click the Parental Controls option, as you did before. 
- To change the PIN, click on the Change button. 
- Type the new PIN and click on Save. 
- Next, scroll down to the Viewing restrictions section, and click on 18+, as shown below. This will mean that no video will require a PIN and all content on the app will be accessible. 
- Then, tap on Parental Controls, as depicted. 
- Tap on Change Prime Video PIN and reset it, as you want. 
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