Crossposting is setting it up so that you can post to LJ as well as to DW from the Update page. You set that up on the Other Sites tab of the Account Settings page -- once you set that up, there'll be a checkbox on the Update page that you can check (or uncheck) to post to LJ. (It also works to post to InsaneJournal, and we used to have a few other LJ-based sites available as well, but sadly, they've closed since or have bugs that prevent it from working.) In the future, we'll be adding other sites such as Blogger, Wordpress, Typepad, etc.
Importing is pulling data from LJ (or another site) into your Dreamwidth account -- you set that up with the link that a few people gave you earlier.
Both of them aren't going to work very well right now, because LJ is having network access problems due to the DDoS, but that's how you set them up, at least!
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Crossposting is setting it up so that you can post to LJ as well as to DW from the Update page. You set that up on the Other Sites tab of the Account Settings page -- once you set that up, there'll be a checkbox on the Update page that you can check (or uncheck) to post to LJ. (It also works to post to InsaneJournal, and we used to have a few other LJ-based sites available as well, but sadly, they've closed since or have bugs that prevent it from working.) In the future, we'll be adding other sites such as Blogger, Wordpress, Typepad, etc.
Importing is pulling data from LJ (or another site) into your Dreamwidth account -- you set that up with the link that a few people gave you earlier.
Both of them aren't going to work very well right now, because LJ is having network access problems due to the DDoS, but that's how you set them up, at least!