Go down to the configure manually option and follow the instructions for iPhone.
I think next guard is also supposed to be decent, but they won't let you use it without an account.
The nice thing about the dns approach is it works for more than just your web browser. There's a bunch of Android games that are essentially unplayable without an adblocking dns.
As a disclaimer, a bunch of sites are ramping up requiring enabling ads or they won't let you load the content. I'm ok with just hitting back and not viewing those sites, but my MIL just asked for help removing the ad guard dns because her news sites wouldn't let her in.