How to print pictures from my iPhone without it having a border?

Sorry this is so confusing. I'm making a collage of pictures I have taken on my iPhone. But everytime that I print them Walgreens squishes it to be a portrait photo by adding a black border. How do I get it to print lanscape?

In the page set, you will find the option to convert your photo in landscape or portrait. You can also increase or decrease the size of printing data.

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