All SPN you receive as Rewards for Charges you’ve been given is staked SPN, meaning the total amount is locked up and will be automatically progressively unlocked within your account over the course of a year. At any point, you’re free to withdraw the SPN that has been unlocked, an example of which is shown here under the ‘Stake’ heading.

To withdraw SPN, enter the amount you’d like to withdraw that is equal to or less than the available quantity and then click the ‘Request Withdrawal’ button. You can then complete the transaction using your linked wallet.