Trying to figure out how to wire a 3rd light switch into and existing 2 switch panel.
There are 3 wires from the existing 2 lights (one white and two red) and a red loop.

My new light with no power is to the 3rd switch, (one red one black). How to I get power from the 1st two switches to the 3rd switch with out it interfering with the existing.

http://i1091.photobucket.com/albums/...psce03f408.png

Depends on how power comes into the switch box. If it is always hot to the switch box, you can take a pigtail off from the hot black, white and ground. However, from your colors, it appears you may have power in the ceiling and switch loops to the switches. In this case, you cannot add another wire. Use a voltmeter to check for unswitched power and then go from there.