If you have a successful vermicomposting bin, chances are excellent that you will want to move some of your worms at some point. You can transfer them to another such bin, of course, but you can also add them to your garden. Just like in their bin, the worms will dig down through the dirt, eating the organic debris in their path. While doing so, they will improve your garden soil's tilth and make it rich in nutrients.
Break up the soil in your garden and turn it over before adding worms. Worms do not like direct light, and will instinctively burrow down into the dirt as soon as they are given the chance. Turning over your garden soil and breaking it up will make it easier for them to tunnel. As long as you keep them well fed afterward, they will do most of the hard work of tilling your garden.
Uncover your vermicomposting bin. Do this quickly, because worms do not like light. They will start to burrow down toward the bottom of the bin. If you are planning to add all the compost from your bin to your garden, this will not matter. If you mainly want to add worms, work quickly.
Dig up a big shovelful of worms and compost from your vermicomposting bin. Try to only use the shovel along the outer edges of the bin, to avoid smashing or mangling worms.
Place the shovel full of worms on top of your garden. If you want, turn the soil over again to help cover the worms with dirt as quickly as possible. However, chances are good that the worms will burrow into the soil very quickly on their own.
Amend the garden soil with plenty of organic matter, such as leaf clippings and grass, on a regular basis. These foods are very attractive to worms, and will help keep them healthy as they improve your garden.