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 DNS option under the Connection section. 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.