Yeah, that checkbox won’t appear until you actually have a renewal coming up. As for how many feeds you have, I’ve made a lot of improvements and can handle up to 4,000 feeds for premium archive users. That’s actually one of the new restrictions: if you have over 1,000 feeds, you have to upgrade to premium archive. Otherwise, you get handed a feed chooser and you have to pare it down to 1,000 feeds.