Mugox

Probably the magazine has to be federated first - and so it has to be searched from the instance. I’ll provide example using magazine AskKbin and assuming you’re using browser version of Lemmy. The local adress for magazine is https://kbin.social/m/AskKbin
Go to your Lemmy and press search button. Search for the magazine using the local adress of the magazine (https://kbin.social/m/AskKbin). Once searched, it should start federating and you can subscribe to it. You should be able to easily subscribe to the magazine as well - as it is going to appear as community in search results. Similiarly you would initialte federation with communities from other instances of lemmy, if they aren’t federated yet

Unfortunately it doesn’t seem to work right at the moment. I still see posts from country specific instance i blocked that way (threads sorted by hot)

You can visit domain page, as you would magazine page, and there is a button to subscribe to it or block it. Here is the link to domain page of lemmynsfw.com, but be warned - you’ll see the post from that instance and some of them might not be properly tagged, so consider it NSFW despite your settings https://kbin.social/d/lemmynsfw.com. That should block entire instance (and i think the magazines/communities you are subscried to are exempted from this block, so you still see those)

You can visit domain page, as you would magazine page, and there is a button to subscribe to it or block it. Here is the link to domain page of lemmynsfw.com, but be warned - you’ll see the post from that instance and some of them might not be properly tagged, so consider it NSFW despite your settings https://kbin.social/d/lemmynsfw.com

deleted by creator

The NSFW blur is sometimes not applied correctly. For example if you have turned on displaying Avatars (or Magazine icons) then those elements are blurred instead of the post preview itself - at least that’s my experience on Vivaldi browser. Styling might be interpreted differently on other browsers. And sometimes it takes a second to apply the style (I think after page reload) so if it’s high up there on the list one might still see NSFW content unblured.