How to create a works page

I'm having trouble creating a works page. Can anyone help me?

From your edits, it looks like you're trying to create a page for this work. The correct page would be Fanfic.Despair Island and Works' Pages Are a Free Launch says you can make a page for any work, but it also warns about having a decent description beyond a stub, and a list of the tropes in the work that should also be crosswicked. If this is your first page, I recommend taking it to the Trope Launch Pad to get help on making sure you know what indexes to put the work on, how much context is sufficient for examples, and a description that gives a clear summary of the work without plagiarizing anyone else's summary.