In Notification Center on your Mac, add and customize widgets so you can keep tabs on your schedule, favorite devices, the weather, top headlines, and more right from the desktop.
Open Notification Center
At the bottom of Notification Center, click Edit Widgets
In the list of widget categories, search for a widget or click a category - some widgets come in various sizes; click a size to preview the information it shows
To add the widget to your set of active widgets, move the pointer over it in the preview and click the Add button (+)
Click Done at the bottom of the active widgets when you're finished
To change the widget's location in your set of active widgets, drag it up or down. If you decide you don't want a widget, click its Remove button (-)