Use the form. It reaches whoever keeps this archive running.
Useful things to write about: a factual error, a piece that has since been overtaken, a broken link or a missing image, or a question about which Polish report something was translated from.
Please do not write for financial advice about anything in the cryptocurrency articles. Those pieces are four years old, they were reporting rather than guidance even then, and nobody here is qualified to answer.
Corrections appear as a note on the article they concern. The original text stays as it was filed.