1. you can't edit them after you post them
you can copy paste the whole artiecle from Comunity/Articles/ Your Articles / click on the one you made and copy it , is fine , is not posted , the work is still original 
Thanks a lot for help!
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I have wrote an article and uploaded some photos in it but for some of them it said error while uploading and later on when i sent the article it shows photos that didn't show up when i uploaded them. Is there any why i can edit that out?