Find "Edit" icon and then click it, you will find video editor. There you can Trim, Crop, Add watermark and Effect. Above all, Subtitle can be added here.
For creating customized subtitle, you can count on free software for subtitle editing:
Subtitle Edit. Go to write the subtitle content there and it will be saved as SRT files, which is supported by Video Converter Ultimate. Then load it to the software for output videos and you will get a characteristic video.
Top 5 Subtitle Sites to Download Subtitles [align=left]