you have to find the correct path and order to match them. But don't worry if you can't find a way to match them, since you can use power ups which will help you find the matches you are looking for. But keep in mind that those power ups are of limited use, so don't overuse them. So hop in and start creating beautiful Butterflies and watch them all fly to their new home!
To remove a pair of butterflies, click the first butterfly, then click the other. A red line connecting the two butterflies displays, as shown in the image below.