So very, very confused

I’m so confused on how this works and when I watched the video it confused me even more! All I want to do is add photo links of items I’m talking about from my post. I have share-a-sale, the url is like a mile long for the picture gallery thing that they have set up for blick arts. I’m so frustrated, it’s not even funny. Please in coding for dummies english explain to me how I’m supposed to make this work. In the video, it was a stock image from the actual amazon site and then some link tab… I’m so lost!

https://www.ads-software.com/plugins/thirstyaffiliates/