How do I edit captions of videos in – Windows Live Movie Maker?
Go through the following tutorials:-
Here You need to go through Adding titles, Captions, and Credits
Important things to be remembered:-
Only the .WLMP Project files can be edited.Once the project is converted and saved in the .WMV or .MP4 movie format it can no longer be edited.
Use this table to find the right version of Windows Movie Maker or Windows Live Movie Maker for your system.