How to you use iframes?

                                                        

Iframes are windows from another platform. These are videos, soundclouds, etc.
To use iframes in your post you need to do the following. 
First you go to Youtube and select your video.
After you click share and click in embet and copy the link of the video.

Then you have to paste the link in the HTML section.

Then is the video in your post embeted and you can see it on this platform. Now you have completed your work. And have a video in your post.

Here is a exampel...