Steps 1-3 are necessary, step 4 is optional! - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -

#Step 1#
Go to the "Settings Tab" > General > General appearance and make sure that "Expose the option to add an ID Attribute to HTML elements" is checked

#Step 2#
Go to the "Design Tab" and add the following ID attributes to the inputs in the property editor:
for the e-mail input: emx
for the password entry: pwx

#Step 3#
On the page (or reusable element) where you created the login fields, go to the "Workflow Tab" and create a new event "page is loaded". Then add the workflow step "Enable Login with Autofill"

Note: Depending on how your login page is built it is possible to use other event triggers than "page is loaded" (e.g. "a popup is opened").

#Step 4#
To prevent the script from running unnecessarily, a condition can be added to the event in "only when". For example:

This url contains "login"

(replace "login" with the part of the URL that is unique for your login page, so that the script is only executed on the login page)