Keychain Access is one way. Browsers have their own way. So depending on which browser you are using do the following..
Safari: Click "CMD+," to get settings and click on Password tab
Chrome: Click "CMD+," to open the settings tab. Click on Show Advanced Settings at the bottom of the page. Scroll to the Password and forms section and click on Manage Passwords..
Firefox: Click "CMD+," to open settings..you get the idea..
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