There is no way to do this. It's a requested feature. I'm assuming you mean how if I type something like [email protected] it will make a link that when you click it, it takes you to your instance's view of it so you can comment and stuff. There's no way to do that for posts and/or comments, sadly.
this post was submitted on 28 Jan 2025
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Make sure you use the original link of the post and not your local version.
Use this icon on a post to copy the original link of it: 
The original url will be the same domain name as the poster's instance. For example your post is: https://lemmy.ca/post/38173834
And my comment is: https://programming.dev/comment/14642812
To view such a link on your own instance, paste it into your instance's search, like this.
This feature request would make it easier: https://github.com/LemmyNet/lemmy-ui/issues/1048
Also: https://github.com/LemmyNet/lemmy-ui/issues/2318
Give those Github feature requests thumbs up reactions so the devs know to prioritize them.
Seems like this also improves the situation and might be launching with v0.20 https://github.com/LemmyNet/lemmy/pull/5057
This is neat, but for some reason it doesn't keep me signed in if I try to access a link from my home instance.
Paste the URL in the search bar, it'll fetch it locally on your instance and get you there. No need for link guesswork to find it on a particular instance.