According to this official guide "Configure Azure Search"(https://doc.sitecore.net/sitecore_experience_platform/82/setting_up_and_maintaining/search_and_indexing/configure_azure_search#_Create_a_Search), first I have created Search Service on Azure.
Secondly, I have disabled all the config files for Solr and enabled config files for Azure Search. Then, I added a single code with URL and API ver, key in ConnectionStrings.config file.
So what can I do next? I cannot see any guides about how to test the connections between Sitecore and Azure Search.