Here's how to deposit Ether into your Abra wallet:
Open your Abra app, to the main screen (now your portfolio view).
Tap: '+Add Money' (now located at the bottom of your screen).
Tap: 'Add from crypto wallet'
Copy the code shown on the screen and paste it on to your third-party Ether wallet, or scan the QR code using your third-party Ethereum wallet.
Abra does not support withdrawals to a contract address at this time, for more info click here.