How to put a pic over another pic on iphone?

I'm trying to make a Lamborghini picture i found on Instagram my lock screen, but its too small and square. Is there a way i can put that picture over a plain black pic so i can put it on my lock screen? (iphone 5)

Get the app squaready

I do this all the time, I just use p! Coverlay (https://itunes.apple.com/us/app/p!coverlay-overlap-unlimited/id882628605?ls=1&mt=8) and enlarge the first pic to cover the entire background however you want, then add and shrink a 2nd pic in front of it after that.

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