If wewe mean posting it on Fanpop, wewe should post it as an article. Chose the option 'Fan Fiction' when wewe are posting it. Obviously wewe should post it in the most appropriate spot, depending on the subject of your shabiki fiction.
wewe have to have an account on fanfiction. YOu go to 'document manager' and pakia your document. Then go to 'new story' and create a new story. I think wewe have to wait 24 hours before wewe can post one though.