Copy/pasting from another comment I made, hopefully helpful. Written for my instance, but the idea still applies:
In the “All” feed and in the community search, you will see every community that at least one person on this instance has subscribed to.
If you want to subscribe to a community that is not from a blocked instance that nobody has subscribed to yet, you need to follow these steps:
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Get the full URL of the community (for example, https://lemmy.sdf.org/c/retrocomputing). You can search for communities in the community browser or in lemmy.directory.
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Open the “Communities” page at the top of the website
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Paste the full URL into the search, switch all search settings to “All”
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Wait 5-10 seconds for our instance to pull in the community from that site
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Click the federated link it gives you (https://sh.itjust.works/c/retrocomputing@lemmy.sdf.org, for example) and subscribe.
That community will now always have the latest posts, comments and vote totals pulled in as soon as the other instance publishes them
EDIT: Should probably mention that as soon as Kbin sorts our their technical difficulties, then you can use this exact approach to pull in Kbin magazines (https://kbin.social/m/cs, for example)