How can I autofill a Webflow membership site form email field with the logged in user's email?

To autofill a Webflow membership site form email field with the logged-in user's email, you'll need to utilize Webflow's MemberStack integration and some custom code.

Here's a step-by-step guide on how to achieve this:

1. Set up MemberStack:
- Create a MemberStack account and integrate it into your Webflow project.
- Define your membership levels and set up your registration and login forms.

2. Add a custom code embed to your Webflow project:
- Access the page where you have the membership form.
- Drag and drop a custom code embed element onto the page, preferably near the email input field.
- Open the custom code embed settings and select the "Before " option for placement.
- Add the following script within the custom code embed:

```javascript

```

3. Modify the code based on your email field input ID:
- Replace `"email-field"` in the code snippet with the actual ID of your email input field. This can be found by selecting the field and checking its settings in the Webflow Designer.

4. Save and publish your changes:
- Save your changes in the Webflow Designer.
- Publish your Webflow project for the custom code to take effect.

With this setup, the script will check if a user is logged in using MemberStack's `onReady` function. If the user is logged in, it will retrieve their email using `member.email` and populate the corresponding email input field with that value.

Remember to test the functionality thoroughly on different devices and browsers to ensure it works as expected.