Magento Go was designed to be powerful and flexible — a platform for eCommerce that can be dynamic and powerful enough for both merchants and developers.
Method 2: If you want to add hosted scripts or invoke custom snippets of code, you can add the code to a Static Block and include it in any or all pages using Frontend Apps.
To add code snippets or link to hosted scripts, you need to include the code in a new static block, and add it to your web store using a Frontend App.
First, be sure to get a thorough understanding of how to insert Static Blocks into your web store by reading How to Place a Static Block Using Frontend Apps.
To verify that the code snippet or script source link that you added with Frontend Apps, go to any page in your web store, or the specific type of page, if you specified one, right click and select View Page Source. Pull up the find tool and search for any line of code from the code snippet (preferably a unique line to avoid having to comb through other code to find it). If you find the code in the page, then it’s running.