To Start click the apple logo, and select System Preferences

Select the Network icon under Internet & Network

in case you see a locked padlock in the bottom left, click on it. Otherwise skip to the next step.

Type your password in the dialog box

Click on the little + icon just above the padlock

Select VPN From the interface dropdown box.

Select PPTP from the VPN Type dropdown box

Enter the name on connection, and click Create

Enter the VPN Server Address and your username that you have received from Torrent VPN. Also check the box that says Show VPN status in menu bar

Click on the Authentication Settings button, and type your password

Click the Apply button to save the settings.

In the top right of the window, click the token icon that looks like this. From that, a menu will drop down. Click on the Connect link for your connecition. This will initiate the VPN connection.

If everything is correct, you will be connected in a few seconds, and a timer will start showing you how long you have been connected to vpn.

Find a setting in the VPN configuration under Advanced -> Options "Send all traffic over VPN connection" that does the above automatically.
Selecting this option has the effect of setting the default route for the system to that of the VPN.