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Use Keywords is set to Disabled by default. This is because Meta Keywords hold little or no value in today’s SEO. This post from Matt Cutts at Google explains why they no longer value them.
Use Categories for META Keywords
This setting is left unchecked by default in an effort to keep the amount of Meta Keywords you use down. If you’re not planning to add many Meta Keywords to your Posts then this is a very convenient option for you. Simply check this box and All in One SEO Pack will use the names of any Categories that your Post belongs to as Meta Keywords for that Post.
Use Tags for META Keywords
Dynamically Generate Keywords for Posts Page
Use this setting if you want your Meta Keywords for your blog page (which can be set under Settings, Reading) to be dynamically generated from the Meta Keywords of the Posts displayed on your blog page. If you leave this unchecked, All in One SEO Pack will use the Meta Keywords set in the Edit Page screen for your blog page.