First, select the video you want to insert the voice, go back to the home menu, open the play store, tap the search bar, and type narrator voice. Download and install this application. After installing, open the app, and type the words or sentences you want. Now tap the narrator voice icon and click. You can see all the names of the select voice. You can change it later by tapping the display icon and sharing this video. If it's okay with you, tap this share icon and click save. Type the file name, then save. Afterward, go back to kinemaster diamond, tap the audio options on the left side, scroll down, select folder narrator voice, and look for the file name we saved. Tap the add button and try it.