If the FTC institutes an adjudicative proceeding (a hearing), the person who originated the matter by complaining to the FTC is not a party to the action and does not have any control over it. The FTC may allow the complaining person to participate in the proceeding by virtue of 15 USC, section 45. This allows participation for good cause, either by counsel (lawyer) or in person. You cannot intervene in an FTC hearing, except by demonstrating that substantial issues of law or fact would not be properly raised and argued—and that these issues are important and immediate enough to warrant additional expenditure of FTC resources. This involvement can be enhanced by subpoena duces tecum.