I'm not exactly sure why it is confusing, but then again, I'm the one who wrote it.
Fastpass attractions are broken into two groups, "Donald" and "Daisy". Well,
three groups, with the third being "not available"...
Donald attractions are also commonly called in ye olde parlance "E-ticket" attractions. They are the most popular.
Daisy attractions are "D-ticket". Popular enough to warrant a Fastpass line, but not the most popular.
For example:
You card will get you X instant FPs for Donald attractions, and X for Daisy attractions, where X is between 2 and 4 inclusive. So, if you were at Epcot and X was 3 that day, you could get three instant FPs for Soarin', or two for Soarin' and one for Test Track, per card. Whatever combo you want.
You can also get three FPs for Maelstrom, or get one for Maelstrom, one for Mission: SPACE, and one for Living With The Land if you wanted.