Thanks for your posting! For the new JIRA add-on, TestRail needs to use HTTPS if your JIRA is also using HTTPS (otherwise, browser would block the add-on pages in JIRA).
Setting up HTTPS on the web server level is a bit out of scope for this forum but this generally involves generating an SSL certificate and changing the Apache vhost configuration accordingly. The following how-to looks really good:
Once HTTPS is working, on TestRail’s side you would only need to update the Web Address setting under Administration > Site Settings and change the address from
I hope this helps and please let me know in case you have any further questions!