Hello,

1. Your issue has been solved. I have removed the privacy and policy posts from the blog archive.

2. You can edit the brands from Products >> Attributes >> Brands >> Edit the brands >> change the logos: https://ibb.co/Wv5bD3W

4. You can hide the email from the post archive page easily from Theme Settings >> Blog >> Blog Archive >> Disable the Meta options: https://ibb.co/JB1XKX2

5. You can try to use the shortcode of that form in the Elementor: https://ibb.co/tKrXR6L

or the direct form like the Mailchimp widget available in the elementor. If that plugin has that kind of widget for elementor you can use it.

Best Regards.