Updating and adding additional language to your marketing opt-in checkbox within Shopify is easy. Let's dive in...
Step Two: Confirm that your Email marketing sign-up option is not preselected. "Against TCPA policy".
Step Four: Copy and paste "Accept marketing checkbox label" into the filter section of "language". This will pull up the Checkout & System / Checkout Marketing section needed.
Step Five: Insert this language "Keep me up to date on news and exclusive offers by email and text message"
Step Six: Click the purple Save button to confirm the changes. Then navigate to your checkout and confirm the changes went through. It should look like this: