This feature is available for all plans.
Head over to VEED.
Create an account or Log in.
Click on Create Project.
Drag and drop the video to the Upload a file part of the window or click on it and you can select the file you want to upload.
Wait for the video to upload.
Click the video clip either on the canvas or on the timeline, this will bring up the Edit Video tab.
You can use the slider to decrease the volume or click on the volume icon to mute it.
If you want to add another audio file, click on Media or Audio tab to upload another audio.
If you are finished editing, click on the Export button at the top right. The project will render and it will redirect you to the video page where you can download or share the video.