Ok. now you already know how to write post. So let move how to insert media like MP3 and video in your post. Below are the step:

1. Get the media link you want to post in your blog. Example here i choose video in youtube. See picture below.
   
2. After get link, go to your blog writing editor and click video button in your editor. See picture below for more detail.
3. After you click video icon, a box will pop up. So put your media link inside the box.
4. Click finish button after finish your work. See video below to see how your post look like.