Connecting to an OpenVPN Server

I’m still very new to understanding all this VPN / Server stuff so please bear in mind when helping.

I am trying to connect to an OpenVPN Server set up by my client.
I am wondering how to do I connect as a client to this server via the Ubuntu terminal?
All they have provided to me is the key and the WAN and LAN of their network.

Thank you.

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Author: Louise Finch