Type with the keys on the keyboard. (obviously) Back arrow works as backspace. Up arrow is shift. Down arrow alone and combined with shift gives you a wider symbol selection. It only works when pressed with numbers and the space bar. (personally I don't like it, plz just give us full keyboard compatibility! -.-) The text variable stores everything you type with it.
My big brain. Oh, and the people who developed the POP happiness font. :) NOW EASIER TO MANAGE! Rather than being bombarded with variables, all of the variables that have to do with rudimentary calculations have been condensed into a simple list! The only important variables are the text variable and typing variables. The typing variable allows user input on the keyboard, so if it's disabled, the user cannot add data to the program. Fun fact: They actually used this font in plenty of classic Mario games.