1.First choose tool integration plugin,take woocommerce and shopify example here
2.When your campaign is created, you can install the tracking code
3.If your store is built on woocommerce, the integration is easy,just download the wordpress module and upload to your woocommerce ,activate the plugin.
4.If your store is built on shopify,you will operate like this
If you feel difficulty dealing with this, you can turn to developers&coders or us for help, we will help you.