We do support multiple users curating their own content. You can assign a user to a Topic in the MyCurator Topic screen. They will then be identified as the author for each article found for this Topic.
If the user is set up with Author permissions, they can only curate articles where they are the owner. Editors and Admins can curate any article. Editors and Admins can also change authors of articles, assigning them to differ users.
With multiple users, you will want to use the Training Posts list format in the Dashboard Menu, rather than the Training Page. Each user can select just their posts using the Filters at the top of this page. Again, those with Author permission can see other articles, but can only curate those where they are the assigned user.