Google Chrome is great for easily managing credentials for the various sights you visit. For convenience, these passwords are stored in local file that you access through Chrome itself.
Copy & Paste this into your Chrome URI: chrome://settings/passwords
You will see a list of credentials which you can search.
To view the password, click on the “show” icon.
Security is handled by Chrome, requiring that you input your Windows (not sure about MAC) user password in order to see the password. You can then copy/paste into your site.