First, go to the Verst dashboard and click Posts. Click the 3 vertical dots on the right of the category name to delete that category, edit it (change the name), or re-categorize* it.
*By re-categorizing a category, you will move all of the posts from that category to any other category you choose.
To manage a post, just click on the category it is in or click Drafts if it has not been assigned to a category. Once you have found the post, there will be the same 3 vertical dot option next to it. Clicking this will allow you to move the post to a category, delete it, edit it, or copy the link for sharing!