To use the Astrill VPN iOS app effectively,follow these steps:

1. Check Availability: Ensure Astrill VPN is available on your iOS device by verifying it in the App Store.

2. Enter Device IP Address: Open the app and go to the settings, then select "IP Settings" to enter your device's IP address.

3. Enable Additional Features: Look for options like "Proxying" if needed and enable it if desired.

4. Select Protocols: Choose the appropriate VPN protocols (e.g., 82.11n, 82.11ac) based on your device's capabilities and the protocols supported by your router.

5. Log In to Account: Go to your account settings, enter your username and password, and log in to your account.

6. Connect to VPN: Once logged in, connect to a website or stream by using the VPN's interface.

7. Check Browser Settings: Ensure your browser is configured to accept VPN access and review any restrictions.

8. Test Connection: Connect to a website or stream to test the VPN functionality and verify it works as expected.

9. Troubleshoot and Update: If issues arise, check IP entry, enable any necessary features, and update the app periodically.

By following these steps, you can successfully use Astrill VPN on your iOS device to enhance security and access.