Below The Editor is the Custom Fields section. This gives you the opportunity to add custom fields to your pages for greater control over sorting and displaying information on your website.
For example: you could add a custom field called “Hierarchy” to your page and give it a value of “1”. Your web developer could then use this custom field in your theme to re-arrange the order of pages in a sitemap, for instance.
To add a custom field to a page simply enter the name of the custom field in the Name field and the value for this page in the Value field and then click on the Add Custom Field button.
Hint: Once a custom field has been added to the system you can then choose to add that custom field to any other page by selecting it from the drop down list that will appear in the name field.
NB: You should consult your web developer or IT department about whether or not to use Custom Fields