Well, that YouTube video is probably wrong. This plugin does not provide any escape code to change the font. It is best if you learn how to use the plugin, by reading it's help file. Quoted from the help file:
"● Changing Font
You can change the fonts with plugin commands or use escape codes (Requires Eli Message Action)"
Either for MV or MZ, you need Eli Message Actions to change the font using escape codes. Otherwise, you will need plugin commands to change the font.