You can add characters, places or whatever structured information you wish to the novel from the Novel detail page. Click 'Add Outline' to start.
Here you can either add an existing entry from The Workshop, create a new Workshop entry or simply just write a name and a description for a quick-and-dirty entry.
You can also optionally add a chapter number which introduces the character so that this entry will not be shown for chapters preceding that one.
Let's select 'Create new workshop entry' from the drop-down to create our protagonist. Now click 'Send' to be taken to the Workshop where you can edit this entry.
You should not check 'Hide this entry' as it will then be useless to your novel. Just enter a name and choose a template.
Once you finish putting in some details (you should especially put some text into the entry's description because that will always be directly visible to your readers), you can go back to your novel and see the entry connected to the novel. You can always edit the entry in the workshop later.
It can also be a great idea not to only put your characters in here, but places, planets, cities or whatever you want to flesh out. You can create your own templates in the workshop to put your data in.
If you open up one of the submissions in your novel you will now see ' Outlines (Characters/Places)' link at the top of the story. If you click this you will see some information about the character that you just put in. This is always accessible to your readers along with the chapter synopsis from before.