I believe a 'rotate' button is something that Lego has on his 'to do' list, but for now you need to correct them before uploading.
If they're taken on a phone (which is usually how this comes about) you don't actually need to rotate them. The problem is just that the phone reads data on the image that tells it to rotate the image automatically, while the gallery software doesn't.
Just open the photo in an image editor, and then save (you might need to make some small change for saving to be an option, otherwise just save as a new image works too) to over-ride the image data that tells photo software which way is 'up'.
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