Please do not create a page which contains questions. Pages in this wiki are supposed to describe the content of the Bloons franchise. Instead, questions like these should be asked in Special:Forum or in somebody's message wall.
Anyways, lemme answer your question. To make a custom font (specifically, the fonts in BestBMCplayer's page), all you have to do is copy the following markup. Replace Alpha with the text you want to add: