You can find the portal, where you can register your study for assessment, under 'Portal (or practice)'.

The Faculty Ethics assessment Committee Humanities (FEtC-H) monitors the integrity of empirical research involving human subjects conducted at the Faculty of Humanities by assessing in advance any planned study with participants on criteria concerning adequate and complete information for participants, acceptable burden and risks to participants, and appropriate data management procedures.

The FEtC-H has a dual structure, look here to get an impression.

Warmly recommended: the e-module Privacy Basics for Researchers and the workshop Quick start to Research Data Management.