Go to the Dash and open the Screenshot tool.

In the Take Screenshot window, select whether to grab the entire desktop, a single window, or an area of the screen. Set a delay if you need to select a window or otherwise set up your desktop for the screenshot. Then choose any effects you want.

单击抓图。

If you selected Select area to grab, the pointer changes into a crosshair. Click and drag the area you want for the screenshot.

In the Save Screenshot window, enter a file name and choose a folder, then click Save.