I don't know much about this, but based on my previous experience, I received free spins when I registered, and I also received 20 free spins when I made a deposit.
However, it is possible that not all users experience this, because if it is given to users, it is a fairly aggressive way for Betpanda to attract users to the site.
One thing I can confirm from own experience is that, I get bonuses on my deposits and these bonuses in form of free spins are always given on specific games where you could use them. In the event that you can’t find your bonuses after a deposit even when you were notified of a bonus, you simply have to ask the support and they would be swift in pointing you the game and how to use your bonus. Mind you, T&C applies.
Yeah, same experience here, it should be automatic or at least it will be present in the "Bonuses $ Offers" in the Profile in the upper right hand corner. And if there's none, then you can see a message of "No bonus offers found at the moment...".
Or if you think that you are titled to a bonus then simply ask the support and see what happens or what you need to do in your end to have that bonus credited to your account.