Save a picture

Click somewhere in the timeline ruler according to the moment of your animation you want to render.

Click on the button on the top of the monitor (central panel).

The selected animation moment is rendered in several formats. You should get an information panel showing the location of these rendered files on your disk:

The location of these rendered files, as their resolution, may be changed in the configuration panel accessible with the button on the left of the top-most button bar.