Once your married you can add on the surname of your husband to your maiden but for signing legal documents and handling business at the bank, things of that nature people will still acknowledege you as your maiden name. You have to go to the social security office, find one near your location. You walk in without appt and bring your birth certificate, soical security card, state id or drivers license, and marriage license. You fill out a form which they will provide for you and when they call you up to the window, you give them the change your name form due to marriage and they will ask you what do you want to change it to and how you want it printed on your new soical security card. You social security number will remain the same but they will change your name under that number in there system. In about 2 weeks they will mail you out a new social security card. Trash the old one because it can never be used again. From here on out your new, official, legal, lastname will be whatever you changed it to. GOOD LUCK!