GameAddict HTML Version a Question

Hİ;
i ve got your product which is Game addict html versiyon.
i ve got some questions
1) how can turn the color from orange to blue if i want.
2) ive got a special logo as like banner top of the website. and i put two small flag there for swtiching language. how can i make it responsive as like its parent divs. which file should i change.
3) why is the search box hiding when i make smaller the browser or on mobile. is there any way to show it.
4) and can you explain me isotope gallery how can i use it dinamickly.

i like this template its awesom thnx you.