After creating your MailMunch account and a test form, obtain the MailMunch site code and copy it.
Now login to your Weebly account and after locating the site you want to add the MailMunch forms to, click on Edit Site
- Click on Setting tab visible in the top bar
- Click on SEO in the dashboard available on the left side of the screen
- Locate Header which should be available after scrolling down a bit and paste your MailMunch site code you copied earlier
- Click Save
- Click Publish
The form you created in your MailMunch account is now live on your Weebly page.