Need Help to Program my Phone Please

Hi. I'm trying to figure out how to make my line 2, be the one that lights up when I lift my receiver. (We have two phones in the office and the other person's phone is line 1, mine is line 2.) Presently, whenever I lift my receiver it lights up line 1 (which is my counterpart's phone line) and I need to make line 2 light up for me when I lift the receiver on my phone. Can you help?? Thank you. Jeannie