Now I'm kind of lost...

Um...

...I'm a little bit lost now... I've just posted one of my stories from my dA accounts (and I intend to post further ones), but somehow the submission process seems to be a bit strange compared to other sites. oO

What do I have to do to become an 'author'? I am able to post stories, all right... but apparently the system doesn't think that I'm an author. Does one has to be added as an author separately (and possibly manually?). And regarding my already submitted story: How the hell do I edit it in case I spot a mistake? I've searched and searched and haven't found an edit button. oO

Thanks in advance for every post which will enlighten me... ^^