Inputs 2/3 are intended for guitar pickups and your laptop headphone output may be too hot and cause distortion. A better solution is an USB interface or use a matching transformer. Or use input 1 with the switch in the line position.

Yes you can. You need a 3.5mm to 1/4-Inch Audio Cable to connect INPUT 2 & 3 of EON10-G2 and headphone jack of your laptop.