Digital certificate for VBA code signing in Office 365
 

How do I set up a new digital certificate for signing my macros in Excel in Office 365. Will it be stored in SkyDrive and available when I open my Excel workbooks on other devices? I am a longtime used of Office, but a much older, hard drive based version, and am just now learning Office 365 (2013) on my new Windows 8 64 bit system.
Thank you in advance.