Can someone help me to get DoH and DoT working in Cloudflare for Families ( 1.1.1.3)?

I have spent so much time and done so many things to get DoH and DoT working but haven’t got it work. Please help me.

The url I got from 1.1.1.1/help :
https://1.1.1.1/help#eyJpc0NmIjoiWWVzIiwiaXNEb3QiOiJObyIsImlzRG9oIjoiTm8iLCJyZXNvbHZlcklwLTEuMS4xLjEiOiJZZXMiLCJyZXNvbHZlcklwLTEuMC4wLjEiOiJZZXMiLCJyZXNvbHZlcklwLTI2MDY6NDcwMDo0NzAwOjoxMTExIjoiTm8iLCJyZXNvbHZlcklwLTI2MDY6NDcwMDo0NzAwOjoxMDAxIjoiTm8iLCJkYXRhY2VudGVyTG9jYXRpb24iOiJCT00iLCJpc1dhcnAiOiJObyIsImlzcE5hbWUiOiJDbG91ZGZsYXJlIiwiaXNwQXNuIjoiMTMzMzUifQ==

You should be able to enable DoH, see https://developers.cloudflare.com/1.1.1.1/1.1.1.1-for-families/setup-instructions/dns-over-https/

Are you enabling it in Firefox or some other way?