I'm confused about how I can link Mastodon and Lemmy sites, say. I have an account on Fosstodon. Can I use it to access and post to https://beehaw.org/c/programming

I'm confused about how I can link Mastodon and Lemmy sites, say. I have an account on Fosstodon. Can I use it to access and post to https://beehaw.org/c/programming for example? I can follow @programming but that's not the same thing? The beehaw site says to search for !programming@beehaw.org but this returns nothing (with the ! prefix) on fosstodon. Am I missing something? #lemmy #fediverse #beehaw