Easiest way would be to send your BTC2 to the staking web wallet
. Staking would begin automatically and continue without interruptions.
But if you want the full rewards, just download
and install the Bitcoin 2 Core Wallet, let if fully synchronize and then import or send your Bitcoin 2s there.
Then all you have to do is keep the application running. Staking will begin automatically 101 confirmations/minutes after you get the first coins if the wallet is unlocked.