to post in a community, first u must join it. ^_^
go to "user profile" at top of rome_area website. then, at the page you're taken to, hit the "click here" link at top of page. and then join.
to post in community:
where u usually go to update your journal to the left of http://www.livejournal.com, notice the "..." next to "update journal". click that.
type what u what to be posted in the community where u usually do.
there will be an option of choosing which journal u want to post in. scroll down to "rome_area" (u must join community first!).
sounds like a lot of steps but it's pretty simple once u get the hang of it. ^_^