Open VPN

Navigate to the Settings>VPN

Click on VPN features and Go to the General setting. Tick the box Infront of Enable Openvpn and Click on Save button.

Go to the Open VPN and click the add button after adding the Name.

After adding the name, you will get the below image and click on upload button for the uploading the OPEN VPN Certificate.

After click on upload button,

Click on Choose file box after click on Apply button.