You can insert IntelliSense Code Snippets using the Code Snippet Picker or typing the shortcut name of the snippet and pressing Tab. When you know the name of the snippet you want to insert, you can do so by typing its shortcut followed by the TAB key. When you have to browse for an appropriate snippet, you can use the snippet picker, which gives you categorized lists of snippets to choose from.
After you insert the code snippet, you modify it to work in your application. For example, you may find that a particular snippet inserts a new method in your application. If you inserted this new method inside an existing method, you would have to delete some extra lines of code to fix the compiler errors. You might also want to change any messages to the user or file names found in the snippet.