General Theme Settings
Favicon is the 16 x 16px image which appears beside the address bar and in the bookmark, history menus, etc.
Custom Feed URL
The custom feed url will replace the default WordPress feed url (eg. http://www.yoursite.com/feed). For example, you can enter your Feedburner URL here.
Whatever you enter in the Footer HTML will add to the footer before the closing </body> tag. For example, you can add your Google Analytics tracking code here.
You can filter the search results by entering the category IDs here. Use minus sign (-) to exclude categories. For instance: "1,4,-7" will display the search results only for Categories 1 & 4, and exclude Category 7.
Check "Exclude Pages in search results" if you don't want your Pages to appear in the search results.
The feed setting works identical as the search setting. If you enter "2,-9", it will include posts only from Category 2 and exclude Category 9 in the RSS feed.