The fastest way is the Feedback button in the footer of every page — it sends the page you are on along with your note, no email needed. For anything longer, email me. Corrections are the most welcome kind of mail, since keeping the data honest is the whole point.
Use Feedback from the filing page itself — the page travels with the report. Every document links the EDGAR filings it was built from, so we can check both sides.
A manager to add
The firm's name is enough. The admission rule is written down, so the answer is predictable.
Anything else
Feedback, a question about a number, a logo or portrait you own and want removed. All of it is read.