Injective Wallet is the wallet you will need to interact with any application on Injective.
In order to add funds into your Injective Wallet, you will need to connect your crypto wallet to transfer your assets. You can check your wallet value on Helix under the Portfolio tab, or at the Wallet section in the Injective Hub.
You can treat the Injective Wallet as a funding wallet. If you would like to make a transaction on Helix, you need to transfer the funds from your Injective Wallet to a Trading Account manually.