How can I do SPOILERS here on KBin ? I've tried all the usual markdown tags and none work

What is the difference between boosts and upvotes?

Is there a way to collapse comment threads? Can something like that be added please.

I can't figure out how to open links to magazines/communities on other instances in kbin in order to subscribe to them. Clicking on it opens the instance in a new tab. Pasting its link into Search for magazines usually comes up empty. I

For example today I saw this post with a link to a lemmy.world community. I click the link and it opens that community's lemmy.world page in a new tab. If I click Subscribe on that page, it asks my for my instance, I enter kbin.social and I get a kbin.social page with 404 Not Found. If I try to search for it on kbin with either the name or the full link, I just get "Empty".

That's just one example, it happens with lots of other ones, too, especially new ones. I've managed to pull foreign ones up sometimes. I assume those are cases where kbin.social already "knows" about a community because someone else on here has interacted with it.

So how do I subscribe to these things?