How to edit the Username and Password fields in Login object?

In the 1Password (standalone) UI, I can see a list of all of my Logins. When I single-click to select one, it displays information about that item in the bottom half of the screen. Included in that information, at the top, are "URL", "Username", and "Password". If I double-click to edit the Login item, I get a popup screen. But, on that screen, the Username and Password fields are NOT listed anywhere!

How do I update these values?

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