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You have to save the photo in a free photo hosting site, or copy and paste the image address!

The easiest way is to grab the esteem app, it’s glitchy and pretty aweful but it simplified the photo aspect! Cheers!

Use Steemit's built in uploading too. You'll see the text to upload the image below the box as you type. It is even in a fancy green. Once you upload the image, copy and paste that link into your profile (or anywhere else you want to use it). :)