Capturing & Sending Screenshots in Spark 2.5.8

Hi,

I have spark 2.5.8,

I’m trying to send screenshot and i’m not sure i’m using the feature correctly , I can click on the capture and send ico, and then an image of my screen appears, but I don’t know how to send it? what do I need to do?

Thanks

press left button of mouse, move mouse, release button.