As with the ADA, to stake a PINT just leave it in your wallet. No need to be locked or take unnecessary risks, leaving it out of your custody as sending to smart contracts for example.
This is because periodically we will take snapshots of the network and redistribute part of the earnings to PINT holders. The period that the snapshot will take place will always be announced in advance on our social networks.
But, we ask for calm, as we are still at the beginning of the development of the entire ecosystem, these periods can be extended a little. As the ecosystem is being delivered and used, these announcements tend to be more periodic.