Open Cart expert to correct the form, send an email and deal with articles

Very burning, needed today (and better now)

1. Problem with the Notify pop-up (a redesigned Feelmart license template is used). This is when the goods have run out and you can send a message saying "notify on availability". Does not open when clicked. It is necessary that it opens, the form is sent and a notification to the admin is sent to the mail after sending
2. Deal with the letter about the registration of a new user. It seems to have worked before, but thats not accurate. In any case, this letter is needed (to the admins e-mail) old or new
3. The products use Options and Variants. There is information that there used to be Articles (in the admin panel there http://xqa.one/x/edj1i.png) and on the site were also displayed. You need to understand what is happening here and display them in the admin panel and on the site

All accesses are available (FTP, base, admin panel)