If you click "confirm" you should see "URL" and "description" - you should be adding a reference. Maybe the wording is ambiguous; we should change "URL" to "reference?"
yes, I would keep tweaking the words if i were you to be exactly explicit/specific. eg:
1. 'like" is better than 'upvote' because it is clear that i am evaluate whether i like(re: enjoy) something, but what metric am i using to [up]vote on something?
2. "Reference URL" describes specifically what you want rather than some random URL.
Great feedback. But what if something is important but I don't "like" it - similar to how I'm not sure whether I should like a post on FB when my boss in unemployed. We've had that feedback too, like "This is awful and heartbreaking - do I favorite it?" (Favorite was the word we used to use).
