How do I change the format a video that I downloaded from my PC.?

I use Muvee autoProducer to record videos from my camera on my laptop, but they are saved in MVE format. Im trying to download them to Youtube but its not the correct format. What can I do to change the format to be compatible with youtube?How do I change the format a video that I downloaded from my PC.?With a software that converts video format.

CAT lose WEIGHT

desperate for advice