Access the DD-WRT router’s web configuration interface by browsing to http://192.168.1.1.
These are some of the most common default IP addresses: 192.168.1.1 / 192.168.2.1 / 192.168.11.1 / 192.168.10.1 or 192.168.30.1.
On the top right, you'll see the DD-WRT firmware version.
Basically, there are the following firmware versions: MICRO, MINI, STD, BIG, MEGA.
If you wish to use OpenVPN as your protocol for connecting to the VPN, you must use BIG or MEGA versions; or at least STD.
OpenVPN is not included in MICRO or MINI firmware versions, so with them you can only use PPTP or L2TP protocol.
Click Administration -> Commands and paste ALL of the text you've downloaded from the config generator.
Make sure you paste everything between ‘#/bin/sh’ and 'exit 0’ – ensure that your FinchVPN username and password are correct.
Now click the ‘Save Startup’ button towards the bottom of the screen.
Next click Administration -> Management, and click the ‘Reboot Router’ button from the bottom.
Give the device a few mins to come back up.