On your left hand side, click on "Settings" / "Manage Wallet" to see the form of managing your created wallets.
Choose which wallet you wish to manage.
When selecting the wallet, the available wallet balance will appear. You can go ahead and topup the wallet.
You can also create a new wallet for your sub-agents. On the top-right, you will see the "Create sub-agent" button that allows you to create a new agency wallet for your sub-agents. You can select either existing user who will use this wallet or create a new user on the fly through the wizard. Once the wallet is created, you can top it up from the same page.
Each wallet will show the historical transactions related to this wallet (Topups/Redeems)