Quick embedding using oEmbed does not work for all sites. So this is how you embed other content.
Find the embed code
In this example I will embed a dipity timeline. So we need to locate the embed code.
Get the code
If you have the option to pick your size use a size that is smaller than 500. In this case I am going to use the small size. With this embed you can also pick the color being used so you can match the color with your blog theme. Click in the embed code area and copy the code.
Embed the code
Add some introductory text and make sure you have the html tag selected. Paste the embed code into the document.
Check your post
If you do not see the post you may need to activate unfilteredmu.