so, if your on a computer, click the windows icon on the bottom left, and search for "paint" , and if you haev that, click on it, and look for a way "open", which will bring you to files to open.
If you are using a phone, you would have to save pictures to your phone, then remove the memory stick and put it into your computer.
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If you want to post on the phone, I do not know how to do those easily when editing