To unlock your wallet you can:
- Click "Settings" at the top.
- Select "Unlock Wallet".
- Enter your password or passphrase in to the pop-up window.
- Go to "Tools" at the top.
- Select "Debug Console".
- Once in your Debug Console enter the command: walletpassphrase YOURPASSPHRASE 60
- Hit enter.
YOURPASSPHRASE should be replaced with your passphrase or password.
The number at the end is how many seconds your wallet will be unlocked for. The above example uses 60, which will unlock the wallet for 60 seconds.