1.Login the router page, and make sure you disconnect the VPN first.
2. Navigate to Parental Control > DNS Filtering > Enable DNS-based filtering, slide the Off button to On.
3. Choose the Filter you want to use,
4. Our route provide 3 different types of filters, choose they right one you like, and then click apply, after that, you need go back to Astrill VPN page, and reconnect the VPN again.