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Pinterest - Rich Pins & Post main image

Hi everyone,
I’m new here and I don’t understand much about web development/programming and all that topics. I’m just a food blogger and recently changed my site platform to webflow. Now I’m trying to get more traffic from Pinterest and I’d like to activate the “rich pins”, but I don’t have a clue about how to do it. I’ve also noticed that the main image of my posts aren’t “pinnable” - do you know why?
Thank you in advance for all the help you can give me!

Hey there

If you could share a link to the site, and your Pinterest that would be helpful

Thank you Jonathan!
Here’s my site:

And what I’ve found about it in Pinterest:

Any help would be truly appreciated!