How to change the mirror for packages

I wanted to quickly change the mirror after a fresh install, and it turned out it wasn't so easy.

Could someone please help and show which servers are actually mirrors for downloading packages and how to use them? Not all servers that distribute ISOs are capable of that, it seems, but then which ones are from the list of mirrors?
 
I think secure level may block it?
It might. What did you set it to?

Code:
     2     Highly secure mode - same as secure mode, plus disks may not be
           opened for writing (except by mount(2)) whether mounted or not.
           This level precludes tampering with file systems by unmounting
           them, but also inhibits running newfs(8) while the system is multi-
           user.
If it's been set to 2 (or higher) the filesystem might be read-only.
 
It might. What did you set it to?

Code:
     2     Highly secure mode - same as secure mode, plus disks may not be
           opened for writing (except by mount(2)) whether mounted or not.
           This level precludes tampering with file systems by unmounting
           them, but also inhibits running newfs(8) while the system is multi-
           user.
If it's been set to 2 (or higher) the filesystem might be read-only.
Yes. 😊
 
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