I left the floating selvage off but if you want to use it, treat it just like you normally do which is over on the right, and under on the left or over on the left snd under on the right. That is how I use it at least. Basically you have two colors. One color starts of the left and one color starts on the right. The color on the left comes to the right one and pulls it into the shed.
The technique is kind of fun because you can decide where the second color stops and starts .