Please note: adding a 3rd lower titling is possible only when styling without captions. You can't use both - a 3rd lower title and captions in the same video.
1. Open the relevant video.
2. Click on Crop, Captions, Logo, Green replace and select Style with no captions.
3. Select the brush icon (1) at the bottom and click on Theme (2), then you will be able to choose the Theme you want for the Lower third Titling (3).
4. You can try different style of 3rd lower titles and see the preview of your video. Once the style that fits your brand is chosen, click Save.
Pay attention: there are 3rd lower titles that last during all the video and called: "Full length" or simple 3rd lower titles that last a few sec. in the beginning
5. Now you can edit your 3rd lower title's information.
6. Click Next to apply the changes and continue styling your video.