The easy way is to go to a different ham web site, www.qrz.com
, and type your call into the call sign search box. As long as your correct address is on file with the FCC your correct address should show up when you do this search. Click on the "more info" button and you will get more detailed info about yourself, and the grid square that your address places you in will also be displayed. This is a quick way to get anyones home grid square.