To remove the request, click on the CONFIGURE ROOM REQUEST button for your trip on your dashboard. Then click the "Never mind! Click here to delete this request!" link in the upper-left.
If you'd like to submit a request, you could pick a room view that you like and in the free-form text area specify that your top request is that the room be connecting to another room (Also list the other party's name and reservation number that should be in the "connected" room).