Download OpenVPN https://apps.apple.com/ba/app/openvpn-connect-openvpn-app/id590379981
Upon opening you should see the below.
Open https://cube.octa.space/ on your device and login.
In Cube, select "VPN" under SERVICES section and browse the available options.
Once you have selected a node, choose "OpenVPN" from the dropdown and click Create.
You will be redirected to the service sessions page. Click on the UUID of the VPN session.
Press the "Download" button, which will download the connection configuration.
Select Open in... and select "OpenVPN"
If successful, you should see the profile successfully imported. Press the "ADD" link.
You should now be able to successfuly connect.
You can create as many connections as you desire and import those profiles into the app. You will only be billed based on traffic through the individual nodes.