First go here: https://my.proxymillion.com/rotating
Then click on the eye icon to the left of your active subscription in the table.
On that page, open the IP AUTHORIZATION panel and enter the IPs of the computers/servers you want to use the proxies from.
Now export the proxies using the other panel in any format you see fit.
From this point on you can use them on any of the computers you entered the IPs from. Use them as regular proxies! The only difference is that the outgoing IP changes every 10 minutes to a new one :)