Magento Products setting SEO

For SEO you can put search key words by login into your Magento Store admin console and opening the product. 

When you open the product, main fields for SEO are

URL_key = this should related to title. When we import products, we already set this to your item title. 
When you click meta information tab , you can enter key words in following fields

Meta Title, 
Meta Key words 
Meta Description