Go to the Vanguard login link: https://investor.vanguard.com/my-account/log-on. Then Enter your username & Password. Click on the “login” button Find help, update your login preferences, and leave feedback via our Support tab. Disclosures. Vanguard login funds not held in a brokerage account are held by The Vanguard Online Registration Login Guide. Vanguard’s online account access provides all of your IARC U.S.