Connecting Prestashop Subscribers from Prestashop Newsletter Signup to Mailchimp

[clky0036]

Hi. I have a Prestashop account and I recently enable the Newsletter Subscription option in Module Manager.

Will truly appreciate if someone can advise on the following: 

1. How do I customise the design of the newsletter subscription box on my website? Eg: The wording, background colour etc
2. I tried signing up the newsletter using other email address to try if it's working. Turned out that the said email wasn't found in Mailchimp contact list. What can I do so that whoever signs up for the newsletter on my website are directly linked to my Mailchimp contact list (without purchasing any addons).

 

Thank you in advance!