Trouble posting my first story chapter

I just posted the first chapter of a novel length story I am writing, but didn't get things exactly right. 1) How do I make my name show up as author instead of "New Author"? 2) How do I select multiple topics in the header categories (where it is allowed)? 3) I posted in an epub format, but what format should I use so that the story is actually visible without having to download the file. 4) How do I link chapters? (Note: I read the blog under frequently asked questions, but I'm afraid I didn't understand all of it and didn't see it until after my initial post) Do I somehow need to remove what I posted and start over?

Can some of you experienced posters give me some advice?

Thanks
Waterdog