HTTPS and mails configuration - using "Webmin"

HTTPS LITTLE PROBLEM
I have already installed an SSL certificate on my website and need the freelancer to configure it on Webmin HTTPS. Currently, when I access every page of my website a browser warning appears close to the URL bar saying that the site is unsafe, just on pharmacomparison.com not in www.pharmacomparison.com, so it may be a silly misconfiguration on pharmacomparison.com

Expected budget 40-50 euro

MAIL CONFIGURATION
- Server Side: i need a short user manual explaining (1-2 pages possibly with screenshots):
- how to configure new email users of the website
- how to set the POP or IMAP addresses
- I need as an example a full configuration of one account, for instance, contact at mywebsite.com
- the new users shall access just their email addresses through their email client (for instance outlook) or web main, not to webmin admin panel.

I have already installed in Webmin Postfix and Dovecot

- Client Side: I need a manual (1 or 2 pages with screenshots) where is written how to configure the email client in both the following cases
- SMTP, POP3
- IMAP.

WEB MAIL: I need to be installed and configured a web mail service to let user access their email also without an installed email client

Ideal Skills and Experience
- Daily usage of "Webmin" to configure server settings
- Experience in Webmin HTTPS and SSL certificate configuration
- Experience with Apache and Linux
- Expertise in mail configuration, especially with Outlook and POP3 client side and Postfix and Dovecot for server side
- Strong communication skills to ensure smooth collaboration throughout the project.