Can I change the login form from an email ID tag to a Username ID tag in Webflow? What is the Username ID for this feature?

Webflow's native login form functionality (via Memberships or Logic) currently requires users to log in using their email address, not a custom username field. Here's a breakdown of your options and limitations.

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1. Native Webflow Login Only Accepts Email  

• Webflow Memberships currently uses email addresses as the primary user identifier.
• The default login form requires an Email field with the input type email and cannot be changed to use a username.

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2. Username Field Is Not Supported for Login  

• There is no "Username ID" option or attribute equivalent to email in the default login process.
• You can collect a username during member sign-up by adding a custom field, but users still must log in with their email, not the username.

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3. Workarounds Using Third-party Tools  

If using only Webflow's native tools isn’t enough, consider these alternatives:

• Use Memberstack, Outseta, or Firebase: These third-party platforms allow more advanced control, including username-based login.
• With these services, you can design a Webflow form and connect it via custom code or third-party UI logic to allow login with a username.

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4. What You Can Customize in Webflow’s Login  

• You may customize the form design, but functionally it must include an Email field, Password field, and a Log in button linked to Webflow’s login action.
• Use the element with Form Block ID = "wf-login" if you're working with logic flows or custom triggers, but again, this won’t change the identifier from email to username.

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Summary  

Webflow does not support username-based login natively. Users must log in with their email address, and there is no username ID for login authentication. To use a username instead of email, you'd need to integrate a third-party authentication service.