Didn't use bootcamp, just upgraded to Windows 10 and now can't reboot in ios

I was runnning Windows 7 Home on an updated 27" iMac via bootcamp. Someone else installed it for me and other than knowing how to reboot in either and then working with ios or windows, I don't anything about Bootcamp itself. Everything was updated, backed up and working great. Then I decided to let Windows upgrade itself to Windows 10 Home for free. Everything went smooth. Except now I want to reboot in ios and after searching for BootCampManager.exe ... it does nothing. R-Clicking on icon now in taskbar does not offer to reboot in ios. How do I fix this??

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