Notice that you can add collaborators. The rules are the same here as for adding a name to a publication, grant, or presentation:
If the person is at Oregon State University, type the last name into the first field on the left;
If the person is not at Oregon State University, enter the name beginning with the second field on the left, first name, initial, and last name. You may add an organization name.
See “Add a Name to a Record” for complete details.