We will show the users how to use the search-engine feature of the app. Tap the "Add" button to add a address pattern
The app shows the input dialog for editing an address pattern that consists of title, address pattern and keyword. For a demonstration we choose the Wolfram Alpha search engine
In the address pattern the users must put "%s" in the place of query. The users have to observe the structure of the address of the search engine when it performs a search to know where "%s" should be placed.
Tap the OK button. The search engine is ready now
To use the search engine the users have to go back to the main page of the app and clear all text in the address box. The users type the keyword, in the case "wa"
Then the users type a white-space character. After that the app will appear as follows
Now the users can type anything the users want to search
Then hit the "Go" button
To clear the feature the users just put the pointer at the starting of the address box