I'm Having Ads but i don't get the rewards

I’ve using brave browser and some ads has appear (12 until now) but the reward doesn’t seems to increment.

I thought you had to sign up with the Brave browser and create a wallet. But I don’t remember how to do that. Go here to see if there is a sign up link: brave://rewards/

I have the browser for a year more or less, and this is the first time it happens to me. Altough it seems to be solved cause it begin to appear the value. Thanks for the response.