Trane Thermostat update to a Nest

[Jeepgirl]

I am trying to change out an old Trane thermostat and upgrade it to a Nest. I have 2 wires that i do not know what to do with. Please can anyone point me in the right direction? I have read so many different things. 

[Patrick_Caezza]

@Jeepgirl 

Post a picture of your current thermostat's wiring here