After installing and starting the Viscosity software, download the OpenVPN bundle via the Tunnelr portal; extract the bundle to an accessible location such as the Desktop. Open the folder containing the OpenVPN files, double click the 'tunnelr-user.ovpn' file.
' will include your actual Tunnelr username.
Viscosity will let you know that it imported the connection successfully; click 'OK'.
Click on 'Preferences' in the Viscosity taskbar menu.
After selecting the current VPN connection profile, click 'Edit'.
Click on the 'Networking' tab and check the 'Send all traffic over VPN connection' checkbox; click 'Save'; close out the preferences window.
Click on 'Connect tunnelr-user' in the Viscosity taskbar menu.
'tunnelr-user' will actually show your Tunnelr username.
You will be prompted to enter your Tunnelr username and password credentials; click 'OK'.
Upon a successful connection, you should see a small popup indicating your newly acquired (private) IP address.
The 'Viscosity' icon should also turn green.