I'm a group moderator and can't find the "moderate message" option!! Where should I be looking??

This is really embarring!! I've been a moderator of a group for years and we've only just set up new members having to be moderated. If we have new member applications I can see pending member and then can approve, deny etc. Now we are moderating new members to start with I can see I have 6 messages waiting for moderating or accepting but I can't access the messages to do it. I know I'm being thick but what am I doing wrong and where do I go to get to the messages to process them?? Thanks for your help, Bunny