How can I add a coupon and manage emails on my Prestige theme newsletter pop-up?

Store Design
1

Hello everyone,

I have been really struggling with an email problem.

I am using a prestige theme, and in this theme, there is a pop-up, asks customers to register newsletter. When someone enters their email there, they receive an email to confirm their registration, and when they click, they are redirected to the store’s page and it says ‘thank you for your subscription’’ and it ends there. What I want to do is 3 things:

  1. When they confirm and are redirected to the website page, I would like to add a coupon and show it on the page when open. Something like, ''Thank you for your subscription, your code is ‘‘WELCOME’’. In which section I can edit the page of customers land in ?

  2. I also would like to send them an email after clicking to confirm their registration, some emails like ‘‘welcome to the club..’’, and again include the code in this email as well, in case they close the first page they land. I want to do this to only new subscribers? how can i manage the mail list like that so only new subscribers gets the email?

  3. I also would like to add unsubscribe button to the email for customers to unsubscribe anytime they want.

I would be truly grateful for any help