This post suggests that Kbin magazines can be subscribed to in the same way as Lemmy communities, by searching for them, possibly waiting for one's instance to pull info about the magazine in, and then visiting the magazine through one's instance. However, although my home instance is federated with kbin.social, I am not able to get any search results for kbin.social magazines, and it seems that I am not the only one; see here, here, and here, though that last case seems to have fixed itself on its own. The behavior is the same whether I search by URL (e.g., https://kbin.social/m/fediverse), by magazine name with an at-sign (e.g., @fediverse@kbin.social), or by magazine name with a bang (e.g., [!fediverse@kbin.social](/c/fediverse@kbin.social)).