How do I use the crop / screenshot tools

This expands to display the full tool menu. From here, select the scissor icon.

This opens the crop/screenshot tool. The highlighted window can be dragged as required to set your capture area. Once this is set, select the disk icon to save your screenshot or select the red 'x' icon to exit the tool.

You can also select the easel icon to export the image directly into the LYNX whiteboard app.