There are many methods of introduction. Below is the simple four step process we recommend. Although it doesn't guarantee success, it greatly reduces the chances of failure.
Release the workers from the cage
Partially open the queen cage inside a clear plastic bag. We advise doing this in a car or closed room. Remove the workers from the cage. If the queen comes out first, empty the cage and put her back in alone. Make sure you close the cage again once the queen is inside on her own. The workers should all be in the bag and can be released outside.
Place the queen in the nucleus
Break off the tab at the candy end of the cage and make a small hole through the candy. Go to the nucleus and place the cage, candy end down, at the top of the brood pattern on the middle frame of brood. Feed the nucleus and then close and leave it for a week.
After a week, quickly check the queen has been released and eggs are present. Leave another week before further manipulations.