@M30 

Router's Firmware Version:

1.2.1 Build 20230626 rel.36899(4555)

Hardware Version:

Archer AX72 v1.0

  @M30 

You should be able to open your Tether app up, 

Click on the family button, 

Select the family profile you want to add the website blocker to,

Once that members page has opened click where the members name is at the top

It should then open another page and you'll have a list of different options. 

Click on blocked websites 

Then enter the Web page you want to block and save. 

Word of warning I think you only get 32 entries and they quickly go before you know it. 

Also if your trying to add website blocker for a child's device and they have a vpn on their device and its activated then the cut off times,filters and specified websites that you block won't be stopped until the vpn is deactivated.