Opening files with Macros in Office 365 Excel

I need to open an excel file in Office 365 Excel, the file has macros which must be enabled.  It will not open the file as it should appear.  How do I get it to open with the macros.  In my Office 2010 version it ask if I want to open with macros and the file will open but I need to be able to open this file in Office 365.  So How do I enable macros to be used in 365?

Thanks

Schwaby