You just log into Your GMB (Google My Business now) dashboard and add the descriptor to the Business name. You have to be careful on what you add as there is still discussion on the benefits and pitfalls. Normally the descriptor should reference a city or Neighborhood or something like South Tucson.
<a href="http://localsearchforum.catalystemarketing.com/google-local-important/15009-guideline-change-city-keyword-places-title-allowed.html">GUIDELINE CHANGE - City or Keyword in Places Title Allowed Now</a>
At one point I say, just because she says you CAN, does not mean it's in your best interest to do so. Think very carefully before making any changes to NAP.
New advertising option:
A review of your product or service posted by a Sterling Sky employee. This will also be shared on the Sterling Sky & LSF Twitter accounts, our Facebook group, LinkedIn, and both newsletters.