Step 1: Find your replacement code within SmartrMail.
Instructions on finding this code are here:
Step 2: Navigate to the themes section of the Shopify dashboard and click "Edit code"
Step 3: Search for where you signup form is located (This is usually in the footer or newsletter-form liquid files)
Step 4: Replace the <form> action attribute with the SmartrMail action attribute ex. "https://go.smartrmail.com/subscribe/xyz"
Step 4: On the email address input, replace the name attribute with "subscribe_form[email]" and replace the type attribute with "text"
Step 5 (optional): Repeat step 4 for the name attribute on the first and last name inputs
Step 6: Click Save