Show Column Labels for Custom Post Types
This controls which screens display the SEO Title, SEO Keywords and SEO Description columns. These columns give you an overview of which content you have added SEO Meta Titles, Meta Keywords and Meta Descriptions to. See the documentation on Posts/Pages Table Settings.
By default, only the Posts and Pages boxes are checked, but you can select any other Post Types that you want and these columns will be added to the table. As you create Custom Post Types, more check boxes will appear here.
Display Menu in Admin Bar
This setting is checked by default and will add an SEO menu item to the Admin Bar which shows at the very top of your screen. This allows for easy access to the settings in All in One SEO Pack. If you do not want to access All in One SEO Pack from the Admin Bar, uncheck this box.
Display Menu At The Top
This setting allows you to change where the All in One SEO Pack menu item will apear in the WordPress Dashboard menu. Checking this box will display the All in One SEO Pack menu item at the top of the WordPress Dashboard menu underneath Dashboard. Uncheck it if you would like it to be displayed below the Settings menu item.