Write to contact@sheetloft.com. That address is the only way to reach the site.
Sheet Loft publishes no contact form and no newsletter: it is a static reference, and the pages hold nothing you can submit.
Corrections are welcome. If a page does not match Google’s own list, say which function page it is and what Google’s list prints for it; the data behind the site was fetched 28 September 2026 and carries 516 records.
Source: Google Docs Editors Help, “Google Sheets function list” (support.google.com/docs/table/25273), data fetched 28 September 2026. Data month: September 2026. Record id is printed on each function page.