@alemieux34 

In order for the parental controls to kick in the browser can't have saved data or cookies or cache info in the browser being used. Once those are cleared try visiting a site again to verify it has been blocked. 

When setting up the profile for specific devices, make sure those devices are not capable of changing their MAC address:

https://support.apple.com/en-us/HT211227

If you want to change the DNS address, that can be done by going to your IPv4 settings: https://www.tp-link.com/support/faq/1600/

Configuring the Deco app can only be done in the app, there is not a way to make changes via the web browser.

@Tony I'll try to clear cache and retry. I read up on the MAC address switching and the reason why iOS devices do it and it sounds like a more secure thing.

As for the DNS settings, I was hoping to find an area where I can add 3 addresses. I can do this in System Preferences > Network > Advanced on a Mac. I don't think I want to change Internet Connection Type, right?

@alemieux34 Hey there.  If you're still having problems, you can set the DNS for the decos to Cleanbrowsing.  i use that DNS with my decos.  Here is a link to their information:

https://cleanbrowsing.org/filters