How to write text in jupyter / IPython notebook- How to write text in jupyter / ipython notebook?

problem ：

Here is an example of IPython notebook in which besides the input and output cells we have a plain text. this It's a IPython notebook Example , In addition to the input and output cells , There is also a plain text .How can I do the same in my IPython notebook? How I am in my IPython Do the same thing in your notebook ？At the moment I have inly In and Out cells. At present, I only have In and Out Cell .

Solution ：