How do I make a Groove Forms Field editable only by managers?

In response to a question on the Groove support forum, I've written up a new FAQ:

How do I make a Groove Forms Field editable only by managers?

I'll be migrating the rest of the FAQs onto that list over the next few weeks. I don't like using a weblog for this, much. I could write a custom FAQ tool for my main web site at www.hyperoceanic.com, but I don't have the time. Does anyone know of a good hosted FAQ site?