How to get my photos on Instagram to not have the black border when I upload them?

I have photos I edited in adobe photoshop and I saved them to a flash drive then saved to my computer and sent them to my email on my iphone and now I have a black border when I upload them. How do I make them fit the whole box?

In the faaar left TOP corner it has a box that kind of looks like a frame (when adding the filtre). Just press that and it will remove the boarder.

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