Completion of the site on OpenCart 3

There are 2 problems on the site delavega.ua developed on OpenCart 3.

1) To have people fill in forms, newsletter subscription in the footer, automatically added to the database of subscribers to mailerlite.com Now the subscription form does not transmit data on mailerlite.com

- Our subscription form in the footer - https://prnt.sc/rznlk0

- API of the user from mailerlite - https://developers.mailerlite.com/docs

2) Need the ability to add tags to title and description for page

Now you have no such field or the changes are not displayed on the website.

All work is done on the test site, after completion and verification of work, you must provide us with the files to transfer to the main site.