betrivers $50 bonus code, how do you redeem it?

So I’m trying to figure out the right steps to actually get this $50 bonus code credited. I’ve seen a lot of folks talk about using it when you first sign up, but then some people say you need to enter it during deposit instead. Not sure if it’s supposed to be automatic or if there’s a spot I’m missing to enter the code manually. I want to make sure I don’t blow my shot at the bonus since a lot of these promos can get tricky with fine print and rollover requirements. Would appreciate anyone’s walk-through if you’ve done it recently.