The one thing I might not have made clear is that you have to actually go to the correct URL (with the right get tags) before you write and submit. I forgot that at least twice while trying this out.
@32 Squared: As it stands, you can only connect your ficly to one other node. But what if it matches two nodes, i.e. you are reusing a character from an older ficly, but your new story is meant for a challenge. This method lets you tie your ficly to both, so readers will be able to follow up on your character’s past.