The first way that I present to take and capture screenshots of LG spirit is the one that is the pressure of two keys. In particular, you'll have to press the VOLUME DOWN+ POWER June at the same time.
The two keys, however, are positioned at the back of the smartphone and are very close to them will be really uncomfortable and difficult to capture screenshots of LG spirit using this mode, especially for those with big fingers.
However, if you want to use this mode, simply press the two buttons for a few seconds, a light will flash on the screen to confirm the operation and then, from the notification bar, you can access the screenshot just made quickly or share on web.
The captured screenshots will be saved in the Android gallery, in a dedicated folder.