Thank you for posting your question on WorP’Dev. I’m Nabil, the WordPress Developer
Embedding Youtube, Twitter or other supported content should work out of the box. If pasting the embedded content link into the editor doesn’t work (i.e. doesn’t show the embedded content), that means that you may be using a plugin that disabled embeds.
Please take a screenshot of your plugins page and send it here.
If you want this fixed real quick and want to cut the back-and-forth. You can book me for a couple of hours and let me fix this for you. Sound fair enough?