public int getMeetingAdminIndexByUsernameAndMeetingID(int meetingAdminID, String username){
        for(MeetingAdmin meetingAdmin : meetingAdmins){
            if(meetingAdminID == meetingAdmin.getMeetingID() && username.equals(meetingAdmin.getUsername())) return meetingAdmins.indexOf(meetingAdmin);
        }

        return -1;
    }