Here, there is an article that contains a picture. Notice it has 1 part, and this article is the first part (i.e., 1/1, in other words, part 1 of 1). Also, the name of the file the picture will be held in is opus105.gif.
We need to tag and save all the articles that contain the parts of the picture. Since this picture only contains one part, we need only tag this article. To tag the article while the highlighted bar is on it, press t.