There are two Ways to change the DNS settings on iOS Devices.
1. Within the PIA App
2. Within the iOS Device Settings
Change DNS With PIA App
Step 1: App
Open the Application
Step 2: Settings
Go to the application Settings by selecting the three horizontal lines in the top left Corner and then select Settings
Step 3: Change DNS
Once in the Setting menu locate the Network tab and tap on it. You will then see the DNS option.
There the application will have automatically connected to PIA’s DNS. Tap DNS.
Step 4: DNS Options
Here you will be able to ensure that PIA DNS is used, or you can select Custom DNS.
Step 5: Warning
The application will provide you with a warning prompt notifying you that use of a non-PIA DNS could expose your DNS traffic. If you are ok with this select OK
Step 6: Custom DNS
Here you will be able to enter your desired DNS address within the Primary and Secondary DNS options. Select SAVE
Step 7: Reconnect
Once all has been saved it may be best to disconnect and then reconnect to the VPN.