You can stake Algorand yourself through the official Algorand wallet. This can be done on a computer through MyAlgo Wallet and on a mobile device through the official Algorand wallet app. You can also do it through some hardware wallets, such as Ledger.
You can also stake Algorand by simply holding at least 100 ALGO tokens on compliant exchanges, such as Binance, Coinbase, and KuCoin.