unable to connect Helix router through DNS server

Before with my old router I had to connect a wireless router and I was able to add an DNS server to stop adult websites which the new Helix system does but I was also able to block dating sites and anything else I specifically wanted to block. Now with the Helix these dating apps are not blocked and unfortunately they are starting to spam and pop up on my children's laptops. My wife and I want this to stop so I tried to configure a DNS address with the Helix system and it seems I cannot do it. So is there a way to connect my router to the helix and use my router to broadcast the wifi? I would prefer to not do this seeing I had bought pods to extend the range of my Helix system in my house or can my pods connect to my router as well?
Thank you