To record a design video using Tella, first, you need to open the application and select the 'Record' option. This will open up a new screen where you can choose the area of your screen that you want to record. You can choose to record your entire screen, a specific application window, or a browser tab. Once you've selected the area you want to record, click on the 'Start Recording' button. You can also choose to include audio in your recording by selecting the 'Microphone' option.

After you've finished recording your design video, the next step is to edit it. In Tella, you can trim your video, add text, images, and shapes, and even add transitions between different parts of your video. To edit your video, select it from your Tella dashboard and click on the 'Edit' button. This will open up the video editor where you can make your changes. Once you're happy with your edits, click on the 'Save' button to save your changes.

The final step is to share your design video. To do this, go back to your Tella dashboard and select the video you want to share. Click on the 'Share' button and choose the method you want to use to share your video. You can choose to share your video via email, social media, or by creating a shareable link. Once you've chosen your sharing method, follow the prompts to complete the sharing process.