You can use Convertize with your website using Magento 1. All you need to do is install the Convertize pixel (the tracking code that you will receive when creating a project) on your website pages by following these instructions:
1. Login to your Magento Admin Panel
2. Click on “System”
3. Select “Configuration”
4. On the left tab, click on “Design”
5. In the “HTML head” section, paste the Convertize pixel in the “Miscellaneous script” section
After clicking on the “Save Config” button, your pixel is applied to all the pages of your website and you will be able to apply the changes you made on Convertize Editor.