How Use Keyboard Maestro to Log-In To a Webpage?

[tiffle]

You could try looking at this:

Web Login With Keychain

The Store and Retrieve Keychain Passwords topic shows how to use the Keychain to hold your passwords and then use them securely. A common use case for this is to access a web site. Here is an example showing how to do this. The process is pretty simple - open the web page, wait for it to finish loading, and then fill in the form with the username and password and then submit the form. Hopefully the web page will be well and simply designed, and then Keyboard Maestro's Safari popup menus in t…

You never have to put passwords in plaintext in macros and you never should! Have a look at this:
https://wiki.keyboardmaestro.com/action/Set_Variable_to_Keychain_Password

and ensure you use a Local variable to receive the password.