Hi Julianne,
Thank you for reaching out to us. If you’re using Essential Grid for a secondary blog page then you can change the design of your posts using skins, simply assign a different skin to your gird please see https://www.themepunch.com/essgrid-doc/core-anatomy-of-an-essential-grid/#item-skin
You can also edit and customize the skin as you need using item skin editor, please see https://www.themepunch.com/essgrid-doc/item-skin-editor/
If you need to change the design of a page itself then that would require custom development which is regretfully outside the scope of our support you can seek help from a third party developer if you’re not comfortable making these changes yourself.
Thank you for your understanding.