During the signup process, you will be asked to connect your first wallet.
After onboarding, you can also connect new wallets:
Step 1 - Go to your Wallet Management page
From the home page click Wallets (right below the balance), then click Manage wallets ⚙️, and finally Add wallet
Alternative
Go to Settings (right-most icon on the bottom navigation bar), then click Wallets, and then Add wallet
Step 2 - Connect your wallet
In the Select a wallet screen, use the wallet list and search bar to find your wallet's App icon and click it. Follow the instructions to connect.
Note: your wallet will have to be installed as an app on your mobile device or as an extension on your laptop/desktop browser to use the connection flow.
Alternative
Use the Connect manually text input - paste here the address you copied from your wallet app - and click Add wallet at the bottom.