make sure the font is inside your project in the font folder.
Double click the font to get the name you need which is at the top.
open the css and change the line to the fond you want to use in the url
there is a tutorial how to do that exactly.
HOWEVER, if it's not the full game (outside menu etc), than it require a different
And make sure that when giving out the project folder for downloads, the font is included. Otherwise, your audience will just see the normal font preset. This happened to me in RPG Maker VX Ace where I used a cartoony font but my friends all saw some standard, normal font. Which also meant placement was off of the characters in dialogue, menus, and even the status page.