Signing up for Automatic Top-ups

I’m trying to click ‘save’ at the final part of the Automatic Top-ups page, where I am clicking save in order to confirm I’m okay with the PAD terms, but it’s hidden underneath the text explaining all of that… I can’t click it. Is this a glitch? I am on an iPhone, should I try on my laptop instead? I’m not able to currently but I’ll give it a shot later if there isn’t a fix for this. Thanks !