I hope I have enough posts to qualify....
There are three good ways to contact a moderator or moderators.
1) If you report a post and say why you did so, it is likely that several moderators will see the report over a 48 hour period. You could report one of your own posts in a thread where you want a mod to take some action or fix a problem. Every reported post gets looked at, but not always immediately.
2) You can pm a moderator directly to get their attention for your issue. I think most of the active of us will see it within 24 hours and respond.
3) You can post a message on a moderator's visitor wall and tell them of your plight. This should get you a response within a day if the moderator is not weighed down with RL. Of course, such a post is public.
In my case, I am always visible and can fix stuff just about anywhere, but generally only act to reprimand other posters in OT, NESing and IOT. If you asked me to fix a problem in a modiki, however, I would likely disappoint you.