Edit Declare statement in Excel VBA

I am trying to export an excel 2010 file into a SharePoint list and get the error: Compile Error : The code in this project must be updated for use on 64-bit systems. Please review and update Declare statements and then mark them with the Ptrsafe attribute.  And error message:Object could not load because it is not available on this machine.  I am trying to execute the given solutions to change the Declare Statements, but I don't know where to find the Declare statements in Excel VBA. Can anyone help?