Launch the app on your Android or iOS device.
Unlike many other editors, Vita actually allows users to remove the watermark for free directly within the official app. You do not necessarily need a "Mod APK" to get a clean video.
Here is everything you need to know about the Vita app, how watermarks work, and the best ways to get a clean export. What is the Vita Video Editor?
I can provide a or a step-by-step tutorial for any of these.
A professional-level editor for mobile that is completely free and has no mandatory watermark.
If you are looking for an editor that provides a watermark-free experience or more advanced tools, consider these options: