If you have setup a new account, the only items that "transfer" are the Applications. Meaning that the local files for each user are stored in the relevant Documents Pictures Movies Folders etc By default these are not accessible by other users of the iMac. Log in to the previous account and go to the Pictures folder. Locate the Lightroom Folder and move it to the Public > Drop Box folder of the new user account. You will get a message stating that you will not be able to see the items in the Drop Box folder. Once they have finished copying you can log in to the new account. Go to the Drop Box folder and move the Lightroom Folder to the Pictures Folder. Open the catalog by double clicking it. That takes care of the catalog and previews. With respect to the images, if they were stored locally on the iMac they will need to be moved in the same manner. If they were stored on an external drive Lightroom should not have a problem showing them.
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