How to extract data from a website with specifying a search criteria?

I have got this new project that I am not familiar in working with. One task is that I need to navigate some websites to collect some data. One sample website would be this: http://ift.tt/2ldP6K1

I have read and watched tutorials on "collecting" data from a web page, such as:

• How to Scrape HTML Data with C#
• Reading data from a website using C#
• Pulling data from a webpage, parsing it for specific pieces, and displaying it

But my question is how do we usually set preferences pragmatically, to "search" based on our preferences, and then use the above to collect the results?