RSS problems

I just started my wordpress blog a couple days ago, and I am having a problem with my RSS feed. I use Firefox as my browser, and that picks the feed up with the orange icon on the bottom right of the browser, but if i enter my feed URL into feedburner, it isnt recognized. does anyone know what my proper feed url is? here is the address of the blog
https://nick.ottoempire.com/
first of all, my feed is incorrectly linked on the bottom of the page as this “feed:https://nick.ottoempire.com/wp-rss2.php” and that brings up an error when you click it. i am guessing the feed is this “https://nick.ottoempire.com/wp-rss2.php” but that is the URL that feed burner doesnt recognize!

also, are permalink url structures really that important? i would like to leave them as the default where they are archived merely by number, but wordpress themselves says its better to restructure the URLs for link longevity or whatever… i dont understand that at all.