Create a new blog post to update the thumbnails on the Curating page. Here is a guide from Squarespace on how to update blog posts.
Article without an image
Text preview or Author in paragraph text. Place a representative image to the right.
Article with an image
Separate each article with a "spacer" in between.
Heading 1 — Use to call out short paragraphs and quotes.
Heading 2 — Use for page titles
Heading 3 — Use as headers for article titles, etc.
Paragraph — Use as normal text. Use bold and italic as needed.