You can change Resource type from Human to Contact or from Contact to Human.
To do it click on the Change Type button on the Admin page.
Choose Contact Resources to Human Resources or Human Resources to Contact Resources from the drop down list on the left side of the page.
Depending which option have you chosen, a list of Human Resources or Contact Resources will appear.
Choose which resource should be changed to the opposite by clicking the Add All (Plus) button on the right side.
Selected resources will appear in the Selected items board below. When you're sure the selected once have to be changed, click the Create button.