I can't set up email in Apple Mail. on mac mini

I can't set up email in Apple Mail.

Manual setup keeps producing errors and never connects. Then I found an automatic option? After downloading and opening it, you get the following message: Review the profile in System Settings if you want to install it. ?? I go to the system settings on my Mac... well, I don't know where to look (it's not indicated either), but I can't find anything there about the mailbox. Anyone have any ideas? I find it all very strange and am somewhat disappointed in the entire mailbox environment.