Reconfigure OpenVPN connection

Open Network Manager, then go to VPN Connections and click on Configure VPN.

Reconfigure OpenVPN connection

Edit Connection

Select tuvpn connection and click Edit.

Edit Connection

New Node

Now in the gateway field input the new node you want to connect to (in the image london.tuvpn.com), Apply the changes and that's all ! Next time you connect you will connect to the new node.

New Node