[DingTalk Desktop Client]：Click the "Scissors Icon" at the top of the input box, selectable the need range, and click the "Check icon" to send or save, like the showing pictures：

If you want to set the screenshot shortcut key, you can go to the DingTalk desotop client upper right corner find "Avatar" - "Settings" - "Shortcuts" to complish the customize settings in a convenience way.

You can also set [Hide DingTalk window and screenshot] when you place the mouse on the "Scissors Icon" at the top of the input box.：

[iPhone]：Press and hold the Power button and click the Home button at the exact same time;
[Android]: Press and hold the Power button and volume up button at the same time (Android models are numerous, we suggest you use your own mobile phone screenshot method);
After the screenshot, click the message dialog box select [+] - [Photos] and open album to select the screenshot picture to send.