To add a new search engine in Engine API Mode, select it from the list of search engines. Currently, only Google, Yahoo and Bing support this method.
Afterwards, click Get a new user key, in case you do not yet have an API key for this search engine. Thus you will get to the log-in page of the search engine where you can request a key. Enter it into the according field in ASEOPS.
Note: You will need to register for the according service to get an API key. Currently, all the keys are for free.
Then select a region as well as a language. In addition, you can define a maximum number of results which are to be queried and a comment. Conform your entries with OK.