Tap "Assets" located within the bottom navigation bar.
Tap on the + icon
Select what type of wallet (BTC, ETH, LTC etc.)
Select what fiat currency (USD, MXN, CAD etc.)
Enter a name for your new wallet
Tap on Create Wallet
Or simply tap into the search bar and type the wallet you want to add and then tap "create wallet"
Your new wallet will now appear in your account in the Wallets list screen.