Hi there!
I understand it can be tricky the first time. But, to build your own Bitmap font, yous need to think it is a sprite sheet with just one row.
Take a look at these answers on the forum thread(from this post and below):
https://forums.rpgmakerweb.com/index.php?threads/eli-bitmap-font-use-bitmap-font...
If that thread or the help file and the files on the sample project do not help you, let me know what you are doing and I will guide you here.



