Kevin is correct. To manage your brother's DNA results on WikiTree, create his profile and add his email address. That will generate an invitation for him to join WikiTree. Once he joins, help him add his DNA Test information (mitoYDNA ID, Y haplogroup, type of test, lab name, lab kit number, etc.). He should then change his privacy level to “Private with public biography and family tree.” Then he can turn over all the management of his profile to you (i.e. under Privacy settings — he makes you the manager of his profile).