Black rep means reps disabled-It will not show your rep status but you can give and receive reps from others.
This has been added just a few hours ago.
Go to user cp
edit options
uncheck the show my rep level box
save
done
Regarding your other question,you can email the mods to their email in their contact info.ex- *www.thinkdigit.com/forum/member.php?u=1553