To create a design walkthrough video using Tella, the first step is to record. Open the Tella app on your device and select the 'Record' option. You can choose to record your screen, yourself, or both. If you're doing a design walkthrough, it would be beneficial to record your screen so viewers can see what you're doing. Make sure to clearly explain each step as you go along, so your viewers can easily follow.

The second step is to edit your recording. Tella provides a variety of editing tools that you can use to enhance your video. You can trim unnecessary parts, add text or graphics, and even insert additional clips or images. Make sure to review your video thoroughly to ensure that all the information is accurate and easy to understand.

The final step is to share your video. Tella allows you to share your video in various ways. You can upload it directly to platforms like YouTube or Vimeo, or you can download it to your device and share it manually. Remember to include a brief description of your video when sharing it, so viewers know what to expect. By following these steps, you can create a valuable design walkthrough video using Tella.