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Welcome, new users!
(lemmy.ca)
Welcome to the lemmy.ca/c/main community!
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What's likely happening is that when you link through and see "You must log in or register to comment", you aren't accessing that post via the lemmy.ca instance. Your account is instance-specific, but as @Aawr said, you can interact with content from other instances (unless that instance or community has rules to the contrary or has blocked your instance).
The way in which you can access that post via your "home" instance of lemmy.ca is either:
Using these, I found my way here: https://lemmy.ca/post/626156