Changing the Singles/Couples wording on the join page

Im trying to change the words single/couple in the pull down menu in the join page to member/business. It appears to be a java file which i know nothing about. Also a separate issue Id like to address is to have the returned search results for "couple" (or business in my case} to only return results with one picture and description instead of both. Ultimately what Im trying to do(and very close to doing) is to change the couples feature into a business listing with the first or primary in the couple being the business picture and the second being a photo gallery for products etc. any ideas?