OS X Yosemite: Change iCloud account associated with a login

[callorchat]

On my iMac, i have two accounts i.e., myself and wife. Till now, we both have been using my iCloud details. But now I have created a separate iCloud account for my wife as she got her own iPhone. Just want to find out on how to change the iCloud account associated with her iMac login to her new iCloud account rather than using mine. I couldn't find a way to do it. Does anyone how to do it.

Any help is greatly appreciated.

 

[glenthompson]

Sign into her account then go into system preferences and select the icloud icon. You can change it there.