FAQ Question #76
» How do I post in a community?
For most communities, you will be required to join the community and gain posting access before you are able to post entries to the community journal. See http://www.livejournal.com/support/faqbrowse.bml?faqid=101 for information on joining a community. You can then follow the instructions at the bottom of this FAQ to post to the community.
Some communities may allow posting without requiring that you first become a member and gain posting access. If this is the case, you will see a blue pencil icon on the small blue toolbar on the Community Info page (http://www.livejournal.com/userinfo.bml?user=communityname, where "communityname" is the username of the community). Clicking on that pencil icon will take you to an update page where you can compose and post your entry to the community.
In either case, you should note that some communities may be moderated. This means that any entries you make in the community journal will need to be approved by a moderator. You are only permitted to have one entry in the moderation queue at any given time.
You should also note that community accounts do not have posting rights. Community accounts cannot post entries or comments in any journal or community. Users must log in to a personal account (such as the community's maintainer) in order to post entries or comments to existing entries.
TO POST USING THE WEB INTERFACE:
Go to the Full Update page (http://www.livejournal.com/update.bml?mode=full) while you're logged in. In the drop-down list titled "Journal to Post in", you can select the community to which you want to post.
TO POST USING A DOWNLOADED CLIENT:
Many clients available for download include the ability to post entries to a community. For more information on your preferred client, consult its documentation or its menu options. See http://www.livejournal.com/support/faqbrowse.bml?faqid=158 for information on downloading a client.