Screen capture with blender how do I record my screen with blender to answer questions? Do I need to use an external recorder or is there one built into blender?
To create a still image or screen grab of the interface you can press CtrlF3 and save the image.

You will be presented with the option to save to save the whole screen or just the active window.



To record a sequence of steps into a Gif file you need external sotfware. 

Please read the link on meta: What is the process for creating gifs for questions and answers?

Note that when recording video you can only post a file that is under 2MB in size.