I changed it to Arial. (I got the code off the internet)
The code added to fpsplayer:
Script.hudFont = nil
self.hudFont = Font:Load("Fonts/Arial.ttf",20)
if self.hudFont~=nil then
context:SetFont(self.hudFont)
context:SetColor(1,1,1,1)
local fontHeight = self.hudFont:GetHeight()
local hudText = "Health: "..self.health
local x = 0
local y = context:GetHeight() - fontHeight
context:DrawText(hudText, x, y)
The code added to app.lua:
self.font = Font:Load("Fonts/Arial.ttf",10)