Open up your server settings tab by clicking on the Server Name box: 2.
Right click on the name of the person you want to remove in the list of group members on the right of the group, and click 'Remove From Group', as is highlighted in this image: Roles can be used to assign group-based permissions. In order to remove a person from a Discord group, you must be group owner (the person who created the group). How to remove someone from a discord server.