- create account at test.bitgo.com/wallet
- install Google Authenticator on your smartphone (they ask you fro 2-factor auth)
- Create at leat another one wallet to test money send feature
To earn some testnet coins, use testnet faucet or find in Google another one.
Then you will need your receive address, you should follow "Wallets > My BitGo Wallet > Receive" on test.bitgo.com. Then send test coins from faucet to your wallet.
It allows to log in and view current ballance.
In order to send coins you will need "Unlock session"