word2013 How to add a title number

the steps to add a heading number are as follows:

Step One: First open the word2013, free to enter some text inside and divided into good paragraphs. I write 5 paragraphs at random, and all have headings, and we'll add numbers to these 5 headings sequentially.

Step Two: First is the first title, we position the cursor on this title, can be the front, middle, and back of the title, this does not matter, as long as it is in this line.

Step Three: Click the {Number} button under the "Start" tab.

Step four: In the numbered library that pops up, select a number style that you want.

Step five: You can now see the number of the first heading is already available.

Step Six: Then use the same method to add all the headings to the numbering.