You can use the corresponding editing software to add a title to the text column, write your name in the title, then select the effect you like and put it in the corresponding position of the video ~ finally generate a file.

You can also use PHOTOSHOP to design your own personalized signature, save PSD or GIF format, (I don't know if your video editing software supports it) insert the track corresponding to the software, and put it where you want to put it ~ finally generate the file.

There are many nonlinear video editing softwares that can be edited and easy to learn, such as "drawing sound and drawing shadow".