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Just put in the tags of the image your name and that will create the tag. If you write it like "artist:yourname" it will be created as an artist tag. Now, if that doesn't work then go to upper blue bar and click on "tags", search for the tag you created, edit it and change the type to "artist".
> choose post > Click on edit > Write "artist:[Your_Artist_Name]" > Now every time you write Your_Artist_Name when uploading and editing it will be red.