How to add the running line in the video?
Text scrolling across the bottom of the screen like that is called a “ticker.” I used Sony Vegas to make that video. I typed my text in a long straight line, positioned it off the screen, then used automation to move it across. The exact steps of how to make one will vary from program to program, but you can use google to find a tutorial on how to make a ticker with whatever program you’re using.
You just need to learn a little about how to use your video editing software. I know It sucks. We’re musicians, not film makers. It’s not too hard though. If you really don’t want to make it yourself you might be able to get someone to make one for you!