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Since people share Netflix accounts, you might want to be able to keep your profile locked. This wikiHow will teach you how to set a Profile Lock PIN using a web browser. If you try to do this in the mobile app, you'll be redirected to a web browser once you get to the account page.

[Edit]Steps

Go to https://www.netflix.com/YourAccount in a web browser. You can use any web browser to set a Profile Lock PIN on a specific profile.
Click the expand-down arrow next to the profile you want to add the lock to. You'll see a list of all the profiles associated with the account in the header "Profile & Parental Controls."
Click next to "Profile Lock." You should see this menu option in the middle of the drop-down list.
Enter your account password and click . You'll need to enter the account password in order to make changes to the profile.
Click the box next to "Require a PIN" . When you check the box, space for you to enter the required 4-digit PIN will appear.^[1]
Create the PIN and click . You'll need to enter this PIN to be able to access that profile in the future unless you're using an unsupported device.^[2]