Click the "Online Video" icon .
The "Insert video" window appears, you will be provided with 3 options to insert online video content into the text.
Under the topic of the post, select "Youtube" , now enter the keywords of the video to be inserted into the empty box and press ENTER.
The list of videos according to the keywords you enter will appear, now click on the video you need to insert and select "Insert".
The video will automatically be inserted into your Word 2013 text.