To receive your first crypto, the easiest way would be to buy it straight to your wallet using the "Buy/Sell" feature, accessible from the left side menu of the Infinity Wallet.
If instead you already hold crypto on another platform and would like to send it to your Infinity Wallet, you would need to locate your wallet address for the asset you are looking to receive. This can be found in the "Wallet" section accessible from the left side menu, by clicking the "Receive" button on the desired asset's tab.
On pressing the "Receive" button a popup will appear showing your address for the selected asset. You can then click the address to copy it to your clipboard, or scan the QR using another device.
Now that you have your wallet address for an asset, you can send to it from another wallet or exchange.
