Are you speaking about the C6-00 or C6-01?
In the first case, you should go to the File manager, open the Memory card and select Options, then another tab (I can't remember how it's called, but it has a sub-tab) and then Format.
In the second case, you have to long press the memory card icon in File manager and then select Format.
If i have helped at all a click on the white star below would be nice thanks.
Ya.. Thnx dude for guidance. Actually the path is Menu=>Applications=>Office=>File Mgr=>"Open Memory Card"=>Then in OPTIONS, "Memory Card Options", then format