TAMPA — The Department of Health and Human Services on Thursday awarded $67 million in grants to 105 navigators, or groups of people who will help uninsured Americans sign up for health insurance beginning in October. HHS Secretary Kathleen Sebelius made the announcement at the University of South Florida, which received a $4 million grant. Eight groups in Florida will receive a total of $7.8 million. Florida is one of the three states where federal officials hope to add millions of young, uninsured and healthy adults to the pool of people who will buy health insurance through the state exchanges created by the 2010 health care law. California and Texas are the other two states.