From the lesson you would like to edit, go to Slide Editor.
Here you can decide the layout of your slide and add text, video, audio and images.
You can choose the layout of the slide and incorporate different elements into it.
If you would like to further customize your slides we would recommend you use Powerpoint, Google Slides, or canva.com, then import those files onto Nearpod. You can read more about how to do that here.