No problem. If you make any mistakes in your visitor messages and want to fix them, in the right corner of your VMs, there's a link to edit them. This way, you can fix your VMs without having to write a new one.
When you're ready to post to Fanfiction & Writing, you start a new thread and copy/paste your story into the post box. Make sure your story/chapter is complete and fits the rules of the section in every way, and you'll be all set.
I'd expect that to happen quite a bit. I'm on the east coast of America, so I'm in a completely different time zone. You were asleep when I was going to work!
You're actually my first real mentoree. I guess what happens is if you have any particular questions or just need help on PC, you can ask me. Especially if you want to know how Fanfiction & Writing works.