The Preview Snippet shows you how your Page will look in search engines based on the SEO Meta Title and Meta Description you have entered. If you edit the Title and Description settings in the fields below the Preview Snippet and click Publish or Update, the Preview Snippet will be updated to reflect your new Title and Description.
The Title field is where you enter your SEO Meta Title that will be used for this Page. The SEO Meta Title of your Page will appear in the top of the browser and in the source of your Page between the <title> tags. This is the title that the search engines will display in their search results as the link to your site so it is important to keep this simple (60 characters or less) and relevant. There is a character counter that counts the characters as you type to help you stay below the 60 characters. Bear in mind that whatever you enter in this field will be formatted as per the settings in the Page Title Format field in the Title Settings box on the General Settings screen of All in One SEO Pack. See the documentation on Title Settings.
The Description field is where you enter your Meta Description that will be used for this Page. This is the description that the search engines will display in their search results, it will show beneath the Title in search results. Keep the description short (160 characters or less) and relevant. There is a character counter that counts the characters as you type to help you stay below the 160 characters. The Meta Description is a suggestion, some search engines such as Google will sometimes create their own description of your content and display that in the search results instead of your Meta Description. Read the Meta Descriptions documentation for more information.
The Keywords field is where you enter your Meta Keywords that will be used for this Page. 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. However you may feel differently and wish to use them. If you do wish to use Meta Keywords be sure to keep them at a reasonable level and include only the words and phrases which are relevant to your Page. Use commas to separate each keyword.
Robots Meta NOINDEX
NOINDEX is a meta tag that can be displayed to search robots that requests them not to index content. The specific directive differs between each search robot. For example, the directive it gives Google’s search robots is Do not show this Page in search results and do not show a “Cached” link in search results. Other search robots interpretation may be different.
Robots Meta NOFOLLOW
NOFOLLOW is a meta tag that can be displayed to search robots that requests them not to follow any links in your content.
Robots Meta NOODP & Robots Meta NOYDR
These are meta tags which request that search engines not use the information found in the Open Directory Project (NoODP) and the Yahoo Directory (NoYDR). These directories are directories for websites. If you check these boxes you are requesting that search engines use the title and description that you enter into your site via All in One SEO Pack, not the information that can be found about your site in the Open Directory or Yahoo Directory.
Exclude From Sitemap
The Menu Label sets the text used in your website navigation menus for this Page. This is a legacy setting from before Menus were added to WordPress under Appearance, Menus. Here is the documentation for the WordPress Menus system which was first introduced in WordPress version 3.0.
Disable on this page/post
Check this box if you wish to completely disable the All in SEO Pack settings on this Page. If you check this, All in One SEO Pack will not output any SEO Meta Data to the source code for this Page.