The first group of options is connected with page’s title:

• Use blogname in title – this option allows to switch on showing a blogname in the title
• Separator used in title – it specifies a separator which is between a title description and a pages’s name
• Title – description – it allows to specify page’s title description (the first part of a title – before a separator)
• Title – blogname – it allows to specify page’s name (the second part of a title after a separator)

The remaining options allow to switch on advanced management of keywords and description metatags:

In the case of a homepage, these metatags values are specified in a SEO settings panel whereas in the case of subpages, there are two settings available for both metatags:

• Disabled
• Enabled (custom field in the post editor)

When you switch on these settings, under a posts editor two additional fields will appear:

If you fill them in, metatags used on one subpage with an entry will be created.