I'm sure there is a Tut around here for it. You have three options. Buy a two color LED like it, tin and solder two leds to the 3 contact points or only solder one LED.
Its been so long, but after you desolder the existing led there would be three contacts. Use a meter here because I'm going off my memory and I'm old..... I think the middle pin was ground and the lower pin was Power (Green) and the top most pin was Orange (Charge)
If your going the SMD route know that the contact points are small, REMEMBER to TIN!