Here is a where you will find forms for laying out your personal financial inventory. My recommendation is to print out the forms and fill them out rather than do it online. Online may provide Vanguard with personal information you prefer they not have.
If all your portfolio records are already with Vanguard, much can be accomplished online.
This site was recommended amidst a discussion on what to do when one is no longer able to manage their own finances and the spouse has no interest. Who will manage the family finances when I die or am incapacitated?
This is an important topic and one I encourage readers to comment on and add their advice.