Hello I am using Joomla 4.4.5 on PHP 8.2 with Sp Page Builder 5.3.2, helix ultimate 2.1.1 and Investa template

In the footer of the Investa template there is a newsletter form.

I tried to modify that newsletter form to adjust it to my needs, I found the following ready code in the "email body" field:

<p><strong>From:</strong>{{first-name}} {{last-name}}</p> <p><strong>Email:</strong>{{email}}</p> <p><strong>Subject:</strong>{{subject}}</p> <p><strong>Message:</strong>{{message}}</p>

The variables are printed "as is" in the email body, the only veriable that is effectively converted into a text is the {{site-name}} present in the Email subject field ( {{subject}} | {{site-name}} ), all the others are printed as is....

In practice subscribing to the newsletter produces an email with the following subject " {{subject}} | Nameofthe website.domain" and in which in the body one reads the following:

From:{{first-name}} {{last-name}}

Email: [email protected]

Subject:{{subject}}

Message:{{message}}

Which data do these variable should retrieve? how can be that data set to desired values?

Thank you. Best regards