Polarity doesn't seem to matter with these solder tabs. Therefore, solder the red wire to one tab and the black wire to another tab. Insulate all wires and solder tabs from any contact with the keyboard's metal tray. Test your wiring. Add two batteries to the Techno Flash and turn on the inverter's switch. The EL Backlight should glow a nice bright white/blue/green color. Remove the batteries and carefully close the Eee PC, fasten all screws, and connect and reseat the keyboard. Don't force the keyboard back into place. Make sure that your wiring, solder tabs, and insulation aren't interfering with the keyboard's proper seating.