At the moment, you can only fund your Signal wallet through your Busha account.
Steps
Sign in to your Signal account.
Go to Homepage.
Select Deposit.
Choose the Busha wallet you'd like to fund from (NGN, USD, KES, BTC, USDT, ETH, DOGE, and other supported assets).
Enter the amount you'd like to transfer.
Review the details and confirm the deposit.
Once confirmed, your Signal wallet will typically be funded within 30 seconds.