Currently, you need to find a UC who knows how to change the database or ask the DBA for the database (currently the Services Coordinator). Changes should not be made to fields other than those used for check-in or check-out without prior approval of the DBA.
To change an entry select the Add/Modify Item tab, then enter the TCC_CN of the item you wish to change and press Enter. You then make the necessary changes and click Update Item at the bottom of the window when you are done.