Taking a DNA test will match you with any people you share DNA with and are also in the database, so adoptees will gain insight as to exactly who they are related to.
Have any other known biological members take the DNA test as well. The more samples of your family there are, the more the information the database has to use.
Adoption can be a sensitive topic, so try to consult biological families before delving in depth with DNA.
Get familiar with the benefits of DNA testing for adoptees.