[rcentros]

If it's the 5th generation Paperwhite, I think you can add fonts with by putting a blank text file in your root directory titled USE_ALT_FONTS. Then you just add a fonts folder and copy your fonts into that. That's how it works in the Touch, and (I think) the original version of the Paperwhite. (The second two Paperwhite versions would require a jailbreak or software new enough to add fonts.) You won't get the font darkness control with the USE_ALT_FONTS hack.

EDIT: I see you have the Paperwhite 2 listed. That would require one the lateest releases of software for font adding (without jail breaking). I think you can download and install the updates without turning on WiFi. (I can't guarantee that, however as I've never done it.)