Like the title says, if you want to upvote something on KBin, you should use the Boost link, not the upvote button (Why? Don’t know…)
The upvote button doesn’t seem to do much, but Boost accomplishes what Reddit’s upvote did. So if you’re looking to encourage a post, use the Boost link.
Took me a moment to figure out what you were even talking about. The boost button is translated as “upvoto” in Portuguese, so that doesn’t help…
Maybe it should be something like “promover” (promote).