I remember making this thread a while back... sadly, it died.
What you do is you give the two users above a shipping name, like PCTriviaShipping or CuteCharmShipping etc.
Make sure that the shipping term actually makes sense and isn't too random. Also, obey the 25 character and 4 word rule.
The next post after this probably won't be able to use a shipping term yet, but after that it starts.