json:api How to get only two fields shown in my website and how to apply css

Sorry but i have no idea how to work with json:api

API example in English: http://website-example.com/api/get.php?key=64b35af420282e2907e0abde5da4398c&lang=en is given by a website so i can use in my website.

I get this string of information from the link {"Sport":"Data","Liga":"Nepal","Opp1":"Nepal Police","Opp2":"Nepal Army","Start":1545556061,"FullScore":"0-1","Url":"http://website-example.com/online/64b35af420282e2907e0abde5da4398c/632903","Img":"http://website-example.com/img/sport_1.png"},

I want to show in my website ONLY Opp1 Opp2 and Url

I have no idea at all how it works so please if you want to help be specific and detailed in examples.

Thank you