Your blockchain address is like a house physical address. The address itself is in the public domain, but not everyone can get into the house because to get into the house you need a key. On blockchain, your wallet address is public but your wallet cannot be accessed without your private key.
With your private key, you can open your wallet and use the cryptocurrencies it holds. That's why your private key must remain, well, PRIVATE. It unlocks the 'door' to your address, or access to your wallet where your crypto assets are kept.
Yet, unlike a home address, your wallet can have as many different public addresses as you need.
On the 2key network, you can use a 2key wallet, or connect another ERC wallet such as Metamask or Ledger.