Here are the steps to assign a post to one of the homeboxes:
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1. Open the post you'd like to feature in the manager.
2. Scroll down to the Additionally display in the following areas section.
3. Select from one of the available homeboxes, there are 12 in total.

To replace an existing post you will first need to remove the one already linked to that particular homebox.

The easiest way to identify an element on the homepage and to figure out which Home Box category is pulling it through to the homepage is to use the Edit a post drop-down menu.

This will be displayed at the top left of the homepage when you are logged in as an administrator.
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Once the post is removed from the homebox you can assign a new one by following the above steps.