Q: how to setup pop3 email on ipad mini with iOS 9.3.3

Try the steps in these Apple articles.

Set up an email account on your iPhone, iPad, or iPod touch - Apple Support

Get help if you have issues using a POP email account with more than one device - Apple Support

Those are the only steps Apple recommends. Try contacting the email provider and ask them if they have any special instructions.

Hi. I've seen it suggested that you select Other, then enter a false email address, say fred@junk.net. Since it cannot automatically determine the settings, it will give you the full editing window and you can enter all the correct settings.

Good solve and good to know....