Do you mean to record both (MIC and Line In) simultaneously?
If so, the best you can do is mono, since AC97 sources cannot really be seperated. To do this you should download and install the latest
ProFX (assuming that you are using kX version 3538L). Then in the DSP, replace prolog with ProFX:ADC (connect ADC to same pins on epilog that prolog is currently using). Then open up the tweak window for ADC and choose the preset labeled: "AC97 Left Line / Right MIC".