Is there a way to blow up screens no matter what app I'm in so I can see

I recently suffered a mini stroke and it effected my eye sight so now I cannot read small print even with my reading glasses. On the iPad, I can blow up the screen in most cases but some apps like Facebook I cannot allow you to blow up the screen. Is there any way to blow up the screen no matter what app I'm in??
Also, kind of related to not being able to see...I recently discovered iTunes Radio. I was going thru and adding playlists to my stuff. Seemed easy enough. Until I reopened it today and I see "purchased" next to the only one listed playlist there. Now, I picked about 5 or 6 from their list of recommended list and did not once see anywhere where I was going to be charged. Now mind you my eye sight is messed up but what happened to the little box that would pop up and ask you if you were sure you wanted to make this purchase?? How can I get that back?
And, finally, since I've made this purchase unknowingly, to an account that has no money in it, how do I change my billing info with Apple?
Sorry so long, just been having a bad year. Thank you in advance for any help you can offer!!
God Bless and have a Great Day!!!

Turn Settings > General > Accessibility > Zoom to ON.

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