You can find the CaravelNet FAQ
here. You will probably need to click the Upload My Scores button on the Settings screen in order for the forum to recognize your progress. Note that the top name can be anything you want, but the CaravelNet name needs to be the forum one. If it works, then you will see a green checkmark in the antenna on the title page of the game. Sometimes you also need to quit the game and start it up again for the forum to recognize your in-game progress.
As for that room, it is difficult to explain without pictures. Just in case you aren't able to get the trial CaravelNet working, here is a demo. Download this to, for example, DROD - Journey to Rooted Hold/Data/Homemade, then in the game press F6 to bring up the demo screen. Click Import and navigate to this demo, then OK to import it. Then you can Watch it when you have the room for that demo selected.
Game on,
____________________________
"
He who is certain he knows the ending of things when he is only beginning them is either extremely wise or extremely foolish; no matter which is true, he is certainly an
unhappy man, for he has put a knife in the heart of wonder."
-- Tad Williams