Use ViewDraw AE to edit your schematic files.
To open your schematic file:
Open your project in Libero IDE.
Double-click the schematic file in the File Manager or Design Hierarchy windows. ViewDraw AE opens with the file loaded.
From the File menu, choose Save+Check to create the required files for netlist generation. When Save + Check is complete, the Status Bar will say "Check complete, 0 errors and 0 warnings in project <name>." You must select Save +Check. Only selecting Save will not generate the needed WIR file for that block.
From the File menu, choose Exit. The schematic is saved to the project, appearing in both the File Manager and Design Hierarchy tabs. Your schematic file is updated in Libero.