Bitbit has several options you can choose from to add funds to your account. After logging in and selecting your desired wallet, click the 'Receive' tab or go here if you're using a web browser to see these options:
Wallet address/QR Code
Fee: Free of charge but sender would shoulder the Blockchain fee when sending
Share your wallet address or QR code to your friends and have them send funds directly to your wallet.
Request cash from Facebook friends/contact
Fee: Free of charge for PHP-PHP wallet. Sender would shoulder Blockchain fee for BTC-BTC wallet
If you have Facebook friends or contacts that have Bitbit account, you can request cash from them.