Some 1&1 tools provide you with a code snippet that you can add to your own website's code to integrate the element that tool created. To do so
1. Copy the code onto your clipboard
2. Open your HTML editor
3. Find the place you would like to add the element
4. Paste the code
5. Save and publish (upload your website files to your web space)
Please note: If you are using the 1&1 WebsiteBuilder to build your website, you only need to click on Extras and select the element from the list.