Connection problem with HTTPS Help

Hi I’m using the nextcloud freenas plugin I want to securely connect to my nextcloud (HTTPS) and that I type in my browser along with my domain ( so I get it:
(My domain) is using an invalid security certificate. The certificate is not trusted because it is self-signed. This certificate is not valid for domain. Error code: SEC_ERROR_UNKNOWN_ISSUER.
And I know there’s a sure way to put the security signature in the browser but the problem is that I’m also signing in from devices that will not be able to insert the signature so I realized I need to set my nextcloud as HTTPS in a way that will work on all devices from scratch and
I do not understand the language of command or how to use of commands. Yes, I have knowledge of networks and computers and all these things.
And I need to set my nextcloud as HTTPS rather than HTTP
(My ports in Rotter are 80 (HTTP) and 443 (HTTPS)
I will really admit and be happy to solve this problem
I understood from the community in Freenas that I need to talk to you and I realized that I need to use Let’s Encrypt and I wanted to ask if you have a plug-in that will save all the messing with commands because like I said I do not really know and understand how to use them and whether there is a plugin or something similar or at least a good and understandable guide just reminds I use FreeNAS


No, sorry. Let’s Encrypt is an external solution and doesn’t integrate with NC.

They do however offer the following guide page:

You know by chance which software and which system I have to choose the possibilities that will work with freenas?


Lets encrypt is pretty simple to use !!!

Go to that page
Use the dropdown box to match your system.
Follow the guidance.
Done. No hassle.

If you use freenas, follow this
In case freenas is running from FreeBSD11 and NGINX and can be acces via ssh with root and freenas password.