Delete thread?

Is there anyway I can delete a thread?
It is for an old sun tach...
Apparently I prices it to low or its just a very popular item...
I sold it the first day but am still receiving messages with interest in it.
If someone could please tell me how to delete this please.

 

Go to your add and EDIT with large ----------SOLD-----------

 

.... It's already there.... But I don't think anyone actually reads the adds

 

For future reference, I think you can also open your original ad and edit the thread title to indicate "SOLD".