My name is Alex, I'm a guru here at Shopify!
No problem! You can do this by modifying the links you already have with a NoFollow tag. To do so, open up that blog post and click on the HTML view, like so:
Once done, you'll be able to see the HTML links that you've entered there. You'll want to add rel="nofollow" in between the a and href sections of those links - once done, it should look like the second example:
Hope that's helped! Please feel free to let me know, and you can always give us a call or start a live chat at any time. We're open 24/7 for your convenience and always happy to assist!
Alex | Shopify Guru