stop icloud nag window

My Mac Pro uses my iCloud password to log in. The downside of this, however, seems to be a system preferences nag window reminding me that I only have the base iCloud storage. I then have to click "Manage" and "Done" before I can put system preferences away. This is a annoyance but sometimes system preferences doesn't load all the way and I have to force quit the machine because System Preferences will not allow a restart. So, two questions how do I eliminate this nag screen and , if I can't, what is the name of the System Preferences process so I can at least try to kill it with Activity Monitor?