Firstly, you need to add a client credential on the server side and copy the generated ovpn file to the clients.
$ sudo easy-openvpn.add-client foo > foo.ovpn
Most users simply copy the .ovpn client config file to their home directory and connect to the server directly. Unfortunately, the connection won't be established due to the strict confinement. You need to connect to the home plug as follows:
$ snap connect easy-openvpn:home :home
On the client side, please connect to your VPN server with the generated .ovpn file.
$ sudo easy-openvpn.connect-server foo.ovpn
Once a connection is established, the output should end with the
Initialization Sequence Completed message.