Benefits paid to you as a spouse will not decrease your spouse s retirement benefit.  In fact ,the value of the benefits you may receive , added to their benefits , may help your spouse decide if taking benefits sooner may be more advantageous .
How do I apply?
ICall first to make an appointment f you do not live in the U.S. or one of its territories,you can also - Contact the nearest U.S. Social Security office , U.S. Embassy or consulate .