The usual way of finding the LFC is to lift a parcel from a lower level along the dry adiabatic lapse rate until it crosses the saturated mixing ratio line of the parcel: this is the lifted condensation level (LCL).
To locate the LFC, one typically lifts a parcel from a lower height using the dry adiabatic lapse rate until it crosses the saturated mixing ratio line for that parcel; this crossing point is known as the lifted condensation level (LCL).