It's easy! Just click on the box in the upper left hand corner titled "Welcome/Visitor" and put in a user-name and password. After that, just sign in if you want to post anything.
It would be nice if you put yourself in the " meet your neighbor" section. Just click on that tab.
If you post a comment in the discussion section; You have the option for just Windmill to see the posting, or other groups. Just click on the circle tab to send it to where you want it posted. That is why you may see posting under Windmill that may not apply to us. Those folks send it out beyond their association.
So each time you post something, it would be a good idea to put Windmill in the topic tag as the first word.