How do I format a thumb drive in Kubuntu Hardy KDE 3.5.9

[Steven Vollom]

Meti info says that the thumb drive has only 25% of 1gb remaining; 
Dolphin says the drive is empty.  Apparently it is nearly full, because 
when I try to put a 700mb file in it, it says it does not have room for 
it.  TIA for any help.
Steven