On occasion one may experience an iCloud pop up or two that prompts them to input their password. Rest assured that this is a very common problem amongst Mac desktops, especially those using OS X Mavericks or OS X Yosemite. In order to shut these off there are a few simple steps that need to be followed.
You will first need to go to your settings and choose the System Preferences category. Once you’ve done that, search for the iCloud option and click that. You will then need to sign into iCloud at the OS X panel. If the user is already logged in and is experiencing this problem, there should be a quick fix by simply logging out and logging back in. After you’ve logged in, close out the window and you should be good to go.