In the top right corner of each widget, you will find the Widget Options menu. Each icon from left to right is defined as:
Download icon: download the variable's data currently displayed in the widget of the variable, i.e., if you download a metric's data, you'll get only a single reading.
Pencil icon: lets you change the widget type, devices, and variables displayed.
Arrow icon: display sharing options 1) a public URL or 2) the snipper for embedding to another site's source code. For more on embedded code click here.
Sprocket icon: default settings of your widget (e.g. time frame of data displayed, colors, zoom, and other visual elements depending on widget type).
Trash can: delete the widget